IMPROVED METHOD AND SYSTEM FOR PROVIDING CLIENT CALLBACKS THROUGH A FIREWALL WITHIN AND BETWEEN ENTERPRISES

Abstract: A system for providing client callbacks includes a client having a client application and a client firewall operable to block a client callback to the client application from a server. The server includes a server firewall and a server workspace. The server workspace has data protected by the server firewall and a permissibility framework associating a predefined type of the data with the client application. The server workspace is operable to generate a client callback for the client application in response to the presence of the predefined data type. A server-side proxy is operable to provide the client application access to the server workspace through the server firewall. The client application is operable to connect to the server workspace via the server-side proxy to receive the client callback.

Description: IMPROVED METHOD AND SYSTEM FOR PROVIDING CLIENT CALLBACKS THROUGH A FIREWALL WITHIN AND BETWEEN ENTERPRISES TECHNICAL FIELD OF THE INVENTION This invention relates m general to the field of supply chain, enterprise and site planning and, more particularly, to an improved method and system for providing client callbacks through a firewall within and between enterprises. BACKGROUND OF THE INVENTION Supply chain, enterprise and site planning applications and environments are widely used by manufacturing entities for decision support and to help manage operations. Decision support environments for supply chain, enterprise, and site planning have evolved from single-domain, monolithic environments to multi- domain, monolithic environments. Conventional planning software applications are available m a wide range of products offered by various companies. These decision support tools allow entities to more efficiently manage complex manufacturing operations. However, supply chains are generally characterized by multiple, distributed and heterogenous planning environments. Thus, there are limits to the effectiveness of conventional environments when applied to the problem of supply chain planning due to monolithic application architectures. Further, these problems are exacerbated when there is no one "owner" of the entire supply chain. It is desirable for the next evolutionary step for planning environments to establish a multi-domain, heterogenous architecture that supports products spanning multiple domains, as well as spanning multiple engines and products. The integration of the various planning environments into a seamless solution can enable inter- domain and inter-enterprise supply chain planning. Further, an important function provided by some planning applications is the optimization of the subject environment rather than simply tracking transactions. In particular, the RHYTHM family of products available from 12 TECHNOLOGIES provide optimization functionality. However, with respect to planning at the enterprise or supply chain level, many conventional applications, such as those available from SAP, use enterprise resource planning (ERP) engines and do not provide optimization. The success or failure of an enterprise can depend to a large extent on the quality of decision making within the enterprise. Thus, decision support software, such as 12 TECHNOLOGIES' RHYTHM family of products, that support optimal decision making within enterprises can be particularly important to the success of the enterprise. In general, optimal decisions are relative to the domain of the decision support where the domain is the extent of the "world" considered in arriving at the decision. For example, the decision being made may be how much of a given item a factory should produce during a given time period. The "optimal" answer depends on the domain of the decision. The domain may be, for example, just the factory itself, the supply chain that contains the factory, the entire enterprise, or the multi-enterprise supply chain. (The latter two can be considered to be larger domains or multiple domains.) Typically, the larger the domain of the decision support, the more optimal the decision will be. Consequently, it is desirable for decision support software to cover ever larger domains in the decision making process. Yet, this broadening of coverage can create significant problems. One problem is to efficiently share data between a large number of domains, which are each typically protected by a firewall. Existing methods typically utilized a proxy for each firewall. The proxies are remotely accessed to provide a path through the firewalls. Provisioning of such proxies to each client in a large domain system, however, is time consuming and costly as each client needs to individually test and implement the proxy on their system. In addition, many clients are reluctant to implement such proxies . SUMMARY OF THE INVENTION In accordance with the present invention, a method and system for providing client callbacks through a firewall within and between enterprises are provided that substantially reduce and eliminate disadvantages and problems associated with previously developed systems and methods. In particular, the present invention provides a method for enabling client callbacks in the absence of client-side proxy processes. In one embodiment of the present invention, a system for providing client callbacks includes a client having a client application and a client firewall operable to block a client callback to the client application from a server. The server includes a server firewall and a server workspace having data protected by the server firewall and a permissibility framework associating a predefined type of the data with the client application. The server workspace is operable to generate a client callback for the client application in response to the appearance of the predefined data type. A server-side proxy is operable to provide the client application access to the server workspace through the server firewall. The client application is operable to connect to the server workspace via the server-side proxy to receive the client callback. More specifically, in accordance with one embodiment of the present invention, the client application is operable to periodically connect to the server via the server-side proxy to receive any client callback and to disconnect from the server in the absence of the client callback. In another embodiment, the client application is operable to remain connected to the server via the server- side proxy and to download the predefined data type in response to any client callback. Technical advantages of the present invention include providing an improved method and system for providing client callbacks through firewalls within and between enterprises. In particular, client callbacks are received by a client application by periodically polling or remaining connected to the server. As a result, client callbacks are provided without the expense associated with employing individual client-side proxy processes for each client node. Accordingly, data is efficiently shared within and between distributed nodes of one or more enterprises. Additional technical advantages should be readily apparent to one skilled in the art from the following figures, descriptions, and claims. BRIEF DESCRIPTION OF THE DRAWINGS A more complete understanding of the present invention and advantages thereof may be acquired by referring to the following description taken in conjunction with the accompanying drawings, in which like reference numbers indicate like features, and wherein: FIGURE 1 is a diagram of one embodiment of a computer implemented architecture that can support enterprise collaboration; FIGURE 2 is a diagram of one embodiment of components of a global collaboration framework; FIGURE 3 is a diagram of the global collaboration framework of FIGURE 2 where certain software elements that make up particular modules are highlighted; FIGURE 4 is a block diagram of one embodiment of a system allowing collaboration within and between enterprises for optimal decision making ; FIGURE 5 is a block diagram of one embodiment of the use of a global collaboration workspace; FIGURE 6 is a diagram of one embodiment of a lifecycle for a collaboration; FIGURE 7 is a diagram of situations where common software is present on both sides of a relationship and where it is not; FIGURE 8 is a block diagram of one embodiment of a security configuration for a hub-to-spoke and hub-to-web case; FIGURE 9 is a block diagram of one embodiment of a security configuration for a hub-to-hub case; FIGURE 10 is a diagram of one embodiment of designing an inter-enterprise workflow that includes parameterization over groups; FIGURE 11 is a diagram of one embodiment of managing change be modifying a design of a workflow; FIGURE 12 is a diagram of one embodiment of integration of a workflow with the outside world; FIGURE 13 is a diagram of one embodiment of a data flow running in a single activity; FIGURE 14 is a diagram of one embodiment of a data flow split across multiple activities; FIGURE 15 is a block diagram of one embodiment of an common data model based transformation model; FIGURE 16 is a diagram of one embodiment of a direct transformation; FIGURE 17 is a diagram of one embodiment of different access and transformation levels; FIGURE 18 is a diagram of one embodiment of substituting a hub engine for a spoke engine within a collaboration; FIGURE 19 is a block diagram of one embodiment of a computer system using a workspace configured according to the teachings of the present invention; FIGURE 20 is a diagram of one embodiment of the workspace of FIGURE 19 configured according to the teachings of the present invention; FIGURE 21 is a block diagram illustrating client and server firewalls within the global collaboration framework in accordance with one embodiment of the present invention; FIGURE 22 is a flow diagram illustrating a method for providing client callbacks in accordance with one embodiment of the present invention; and FIGURE 23 is a flow diagram illustrating a method for providing client callbacks in accordance with another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION Improvement of decision support processes involves expansion to provide enterprise level and multi-enterprise level decision support for optimal decision making. Technologically and conceptually, providing enterprise-level and multi-enterprise level decision support differs from providing factory-level and supply-chain-level decision support. The reasons for this can be that, in multi-domain situations (such as business units within an enterprise or multiple enterprises), the different domains often operate different decision support software. Also, in multi-domain situations, one domain generally can not coerce another domain into making a particular decision. In other words, optimal decision support in this environment often needs to be performed in a negotiated, as opposed to coercive, environment. Providing decision support in multi-domain situations can be accomplished by pursuing a collaborative approach to decision support rather than a coercive one. Various communication and distributed processing technologies can be used to implement such an environment, including the Internet, the Web, JAVA, XML, CORBA, etc., which help make large scale collaborative decision making feasible. Products will soon be available from 12 TECHNOLOGIES that enable a collaborative approach to decision support, including RHYTHM-GLOBAL COLLABORATION MANAGER (GCM) and RHYTHM-GLOBAL COLLABORATION DESIGNER (GCD) . Collaboration System and Process Components FIGURE 1 is a diagram of one embodiment of a computer implemented architecture that can support enterprise collaboration. As shown, a global decision support architecture can be built upon underlying link, vision, global messaging and data warehouse components. Collaboration can then involve a global collaboration designer (GCD) and a global collaboration manager (GCM) supported by the decision support architecture. The global collaboration designer can be used to design and instantiate collaborations, and the global collaboration manager can be used to run the collaborations. In this scheme, collaborations can be referred to as modules and can be versioned. FIGURE 2 is a diagram of one embodiment of components of a global collaboration framework. As shown, the framework can allow an hub enterprise 2 to collaborate with a spoke enterprise 4 and a web enterprise 6. Hub enterprise 2 and spoke enterprise 4 each include a global collaboration manager 8. Global collaboration managers 8 are coupled to and communicate with respective internal global collaboration workspaces 10. An external global collaboration workspace 12 provides a means for sharing data between hub enterprise 2, spoke enterprise 4 and web enterprise 6. Hub enterprise 2 can also collaborate through an electronic data interchange (EDI) processor 14 with a value added network (VAN) . Further, hub enterprise 2 can communicate and collaborate with other hub enterprises using a global message bus 15. In operation, the primary controller of the collaboration can be the GCM engine 8 of hub enterprise 2. The hub-to-hub relationship can be facilitated by the global message bus 15, and the hub-to-spoke and hub-to-web relationships can be facilitated by external global collaboration workspace (GCW) 12. As shown, a hub enterprise 2 can generally have an internal GCW 10 and an external GCW 12. Internal GCW 10 can be used to share and exchange data with internal user interfaces as well as EDI processor 14. External GCW 12 can be used to share and exchange data with spoke enterprises 4 and web enterprises. For security, external GCW 12 can be installed in a DMZ or outside a corporate firewall of hub enterprise 2. This way no direct connections need to be made from the outside into the protected corporate network of hub enterprise 2. External GCW can accept, for example, HOP, HTTP and HTTPS connections. In particular, the latter two connections are useful for bridging existing firewall configurations. In this manner, no firewall configuration is needed on either the client (spoke node or web node) or server (hub node) side which can make the solution more quickly deployable. FIGURE 3 is a diagram of the global collaboration framework of FIGURE 2 where certain software elements that make up particular modules are highlighted. As can be seen, software for the global collaboration manager module can be present in the following places: in the hub engine 8, in the spoke engine 8, in the hub-user user interface (Ul), in the spoke-user Ul and in the web-node Ul . Additionally, the module can communicate with native applications 17 on the hub enterprise 2 and spoke enterprise 4. Communications with native applications 17 can be either synchronous (dot line) or asynchronous (solid line) . Asynchronous communication with native applications 17 can be facilitated by the internal GCW's 10, as shown. Further, a global series database (GSDB) can be present on the hub enterprise 2 side. FIGURE 4 is a block diagram of one embodiment of a system, indicated generally at 16, allowing collaboration within and between enterprises for optimal decision making. As shown, system 16 includes a hub node 18 which can be a process within a hub engine executing on a computer system. Hub node 18 is coupled to and communicates with a spoke node 20 which also can be a process within a hub engine executing on a computer system. As shown, spoke node 20 can be outside an enterprise boundary 22 of hub node 18. Hub node 18 is also coupled to and communicates with a plurality of spoke nodes 24 which can be processes within a spoke engine executing on one or more computer systems. Hub node 18 can further be coupled to and communicate with a plurality of web nodes 26 which can be processes within a web browser executing on a computer system. In addition, hub node 18 is coupled to and communicates with an EDI (Electronic Data Interchange) proxy 28 which can provide a gateway to EDI systems. Hub engines and spoke engines, together with a global collaboration workspace, can be the primary entities of a global collaboration manager. In this environment, a hub engine is the primary controller of the collaboration. The hub engine can coordinate both global collaborations as well as local collaborations. Global collaborations are those that span hub nodes 18, spoke nodes 20 and 24 and web nodes 26. A local collaboration can run on any single role - hub or spoke/spoke group. These collaborations can be distributed, but stay within the confines of a single enterprise. Hub engines can also coordinate with hub-user interfaces (Ul) as well as the VAN-EDI processor of an EDI proxy 28. In one embodiment, hub engines are multi-threaded engines that can simultaneously coordinate multiple collaborations as well as multiple versions of the same collaboration. Further, the hub engines can dynamically load and execute collaborations. A spoke engine can also operate to initiate a collaboration. In this environment, unlike a hub engine, a spoke engine is not an independent entity. Instead a spoke engine can only coordinate a collaboration in conjunction with a hub engine. Furthermore, a spoke engine can not coordinate with other spoke engines or other web-nodes. Like a hub engine, a spoke engine can be multi-threaded and can simultaneously coordinate multiple collaborations as well as multiple versions of the same collaboration. Spoke engines can also dynamically load and execute collaborations. FIGURE 5 is a block diagram of one embodiment of the use of a global collaboration workspace 30. In FIGURE 5, global collaboration workspace 30 provides the primary entity used to share data/objects between the various entities in the collaboration. As shown, workspace 30 can interface with global collaboration managers (GCMs) 32, a local system 34, a web server 36 and web interface 37 and native applications 38. In general, objects can be placed into global collaboration workspace 30 by one entity and retrieved by another entity. Retrieval can be achieved either by querying or by subscription. In this way, global collaboration workspace 30 combines the attributes of a database as well as a message bus. The global collaboration workspace can be organized as a hierarchy of slots which can be in-memory or persistent. Slots also can be queued or regular, and fine grained permissibilities can be attached to each slot. The permissibilities can be assigned by-user-by-operation. The primary operations can be read, write, take, and subscribe. In-memory slots hold their data in volatile memory. Writing and retrieval from in-memory slots is very fast but subject to loss if the global collaboration workspace 30 goes down. When used with in-memory slots, the global collaboration workspace 30 can be considered a fast, secure, in-memory object database, with security and messaging capabilities. Persistent slots hold their data in stable storage. Writing and retrieval from persistent slots is slower than for in-memory slots, but data is not lost if the global collaboration workspace 30 goes down. The decision as to whether to use in-memory or persistent slots can depend on the application. Global collaboration workspace 30 stores data in the form of objects and can store Java Objects, CORBA objects or arbitrary byte arrays. This, coupled with its in-memory capabilities, makes global collaboration workspace 30 appropriate as a high-speed data sharing mechanism between other object-oriented m-memory engines such as 12 TECHNOLOGIES' SUPPLY CHAIN PLANNER and FACTORY PLANNER. A global collaboration designer (GCD) provides a tool to allow collaboration designers to interactively design, instantiate and deploy collaborations to be run using the global collaboration manager. The output of the global collaboration designer is code that can be automatically loaded and run by the global collaboration manager. The global collaboration designer can allow designers to create new collaborations, retrieve existing collaborations, and version collaborations. The global collaboration designer can also allow designers to design the hub and spoke network for collaborations and design the events and messages of the collaboration. The global collaboration designer can integrate a standard ob ect library and a standard component library for easy usage from within the global collaboration designer. The global collaboration designer can be used to create sophisticated multi-enterprise workflows with synchronous, asynchronous, sub-workflow, and-splits, or-splits, synchronization-joins, heterocast-splits, heterocast-joms etc. Global workflows and local workflows can both be created. The global collaboration designer can provide automatic verification of collaborations and automatic code generation, which code is run by the global collaboration manager. The generated code can be manually edited if desired. Further, the global collaboration designer can provide instantiation of a collaboration including generation of security manager configurations and global collaboration workspace configurations. FIGURE 6 is a diagram of one embodiment of a lifecycle for a collaboration. As shown, in step, a collaboration can be designed using the global collaboration designer. Then, m step 46, a collaboration can be instantiated using the global collaboration designer. The instantiated collaboration can then be deployed, m step 44, using the global collaboration designer and the global collaboration manager. After deployment, the collaboration can be run using the global collaboration manager m step 46. Subsequently, a new instance can be created or a new version of the collaboration can ve created. To create a new instance, the flow returns to step 42. For a new version, the global collaboration designer can be used m step 48 to modify the collaboration. The extension from single-domain decision support to multi-domain decision support can be complicated. In particular, the following discussion describes a number of challenges presented by multi-domain decision support and embodiments of how those challenges are addressed by the present system and process allowing collaboration within and between enterprises for optimal decision making. Representational Heterogeneity One problem with collaboration is bridging representational heterogeneity across enterprises. Before collaboration can successfully occur, the representational heterogeneity across enterprises needs to be bridged. Enterprises often represent the same data m different ways. These differences range from semantic differences, to technological differences, to differences m naming, etc. One obvious solution to bridging these differences is standardization. However, this immediately raises the issue of what standard to agree upon. The present system and process avoid such a requirement. It should be noted that there can be three relevant categories of standards that need to be addressed. These three categories are: format standards, transport standards and semantic standards. Format standards refer to the technological formats in which the data/objects are encoded. Examples include XML, Java Serial Streams, HOP Serial Streams and EDI format. Transport standards are used to pass data around. These can include HTTP, HOP, RMI, DCOM, FTP, Value Added Networks, Asynchronous Message Buses such as MQSeries, etc. Third, semantic standards are the way in which the semantic content of the data is described. Examples include EDI, 12 COMMON DATA MODEL (CDM) . By considering standards in this light, an understanding of the issues can emerge. A lot of the confusion today stems from the fact that many existing standards cover two or more of the categories above and that discussions of the various standards fail to categorize which category is being discussed. For example, EDI is primarily a semantic standard, but also typically implies a format standard (the EDI file format) and a transport (a Value Added Network) . Once this is understood, it becomes clear that the EDI semantic standard can be separated from the other two. Hence, semantic EDI objects can be encoded in other formats such as Java Serial Streams and can be passed over other transport standards such as HTTP. Similarly, XML is primarily a format standard that can be used to encode various semantic standards. Efforts are underway to encode EDI in XML. Several format standards can be supported by the present global collaboration manager, including XML, EDI format, Java Serial Streams (referred to as Java format and not to be confused with the Java Language or Java Platform) and HOP Serial Streams. Of these, in one embodiment, the Java format is the primary format, and the rest are derived formats. Because the Java Format can contain the behavior to produce the other formats, it has been chosen as the primary format. XML, EDI and HOP formats can be derived from the Java Format . FIGURE 7 is a diagram of situations where common software from 12 TECHNOLOGIES' is present on both sides of a relationship and where it is not. As shown, for example, when RHYTHM GLOBAL COLLABORATION MANAGER is on both sides, nothing is to be gained by converting to an intermediate format. This would introduce needless inefficiency, and only data (not objects) would be exchangeable, limiting the range of applications. Hence when the same software is present on both sides, binary Java objects can be directly exchanged. On the other hand, for example, when RHYTHM GLOBAL COLLABORATION MANAGER is present only on one side, XML or EDI-formatted "objects" can be produced (outbound) and interpreted (inbound) . With respect to transport standards, the present global collaboration manager can support a variety of transport standards, including HTTP, HOP, and Asynchronous Message Buses. More details are provided below with respect to Handling Multiple Relationship Types. With respect to semantic standards, the present global collaboration manager can primarily support two semantic standards, EDI and RHYTHM-CDM. EDI can be supported because it is generally the most popular semantic standard. However it suffers from the drawback (amongst others) of not providing deep coverage of the planning domain. The RHYTHM-CDM, on the other hand, provides deep coverage of the planning domain and will provide appropriate constructs for performing multi-enterprise decision support. Additionally, this format is supported by all of 12 TECHNOLOGIES' planning engines. In general, one problem with public standards, such as EDI, is that they may not adequately cover the kinds of data/objects that enterprises would like to exchange. Further, waiting for standards bodies to standardize on a particular object may not be an option, and a supply chain will not have any particular competitive advantage by using public standards. For these and other reasons, the present global collaboration manager supports an alternative approach to standardization by supporting proprietary community standards. For example, using RHYTHM-GCD, a community of enterprises can devise a set of standards that are relevant to that community only. RHYTHM-GCM will support and enforce these proprietary community standards. RHYTHM-GCD also supports a library of building block objects that can be composed into proprietary community standards. Proprietary community standards have a number of advantages, including: they can be designed to exactly cover the kinds of data/objects that enterprises would like to exchange; only the relevant parties need to agree upon the particular standard, hence the process will be much quicker than waiting for a standards body; different standards can be developed for different categories of partners and, in the extreme case, a different standard for each partner; and standards that give the supply chain a competitive advantage over competitors can be developed. Multiple Relationship Types Another problem for allowing collaboration is handling multiple relationship types. Enterprises have relationships of various types with their partners. Some ways relationships can vary are: between major trading partners on the one hand and between minor trading partners on the other; between enterprises of roughly equal influence over the supply chain and between enterprises of unequal influence over the supply chain; and between enterprises with a high degree of technological sophistication on the one hand and between enterprises with an unequal degree of technological sophistication on the other. As should be understood, these different relationship types should be handled differently. The present global collaboration manager can model enterprise relationships as a hub and spoke network, as described above and shown m FIGURE 4. In this embodiment, the four types of relationships are: Hub-to-Web; Hub-to-Van-EDI; Hub-to-Spoke and Hub-to-Hub. Each relationship-type has its appropriate usage. With respect to Hub-to-Web, when people speak of E-Commerce today, they often imply an architecture where a web browser talks to some centralized server. This architecture has some advantages: the infrastructure to support this architecture is typically already m place; and all administration can be centralized on the server side. However, this architecture also has a big disadvantage m that it requires the presence of a human on the web-browser side. Hence system-to-system automation is not possible. Based on these and other pros and cons, this relationship type can be appropriate when an enterprise needs to exchange data with either a minor partner or a partner with less technological sophistication. With respect to Hub-to-VAN-EDI, the vast majority of electronic mter-enterprise commerce takes place today by sending EDI over Value Added Networks. The advantage of this approach can be that system-to-system integration is possible and it is currently supported today. Disadvantages of this approach are: large costs to send data over proprietary VAN's; high administrative costs because of lack of true standardization; requirement for third party tools ust to convert from the true "standard" to a form appropriate for the enterprise; no support for system-to-human integration; and no support for proprietary standards or corporate standards. Based on these and other pros and cons, this relationship type can be appropriate when supporting a legacy VAN-EDI environment. With respect to hub-to-spoke, this relationship type also enables system-to-system integration like VAN-EDI. Architecturally hub-to-spoke is a collaboration between a hub engine and a spoke engine. The hub-to-spoke relationship can have advantages vis-a-vis VAN-EDI: it can use the public Internet to reduce network costs; administrative costs are much lower than VAN-EDI because a large portion of the hub-to-spoke relationship infrastructure can be centrally deployed and administered; true objects (in addition to just data) can be exchanged allowing for much more advanced collaborations; and multiple semantic standards can be supported including EDI, I2-CDM and Proprietary Community Standards. Based on the characteristics above, the hub-to-spoke relationship can be appropriate between enterprises that wish to perform sophisticated system-to-system collaboration. It can also be appropriate where no 12 TECHNOLOGIES' software is present in either of the enterprises. This is because the hub-to-spoke relationship can be centrally deployed by the hub enterprise. With respect to hub-to-hub, the relationship is similar to hub-to-spoke except that it takes place between two hub engines rather than a hub and a spoke engine. Based on this characteristic, the hub-to-hub relationship can be appropriate between enterprises that wish to perform sophisticated system-to-system collaboration. Further, the hub-to-hub relationship can be appropriate when two enterprises have individually and separately purchased RHYTHM-GCM and have set up hub engines . There are differences between hub engines and spoke engines. In general, a hub engine's capabilities are a superset of a spoke engine's capabilities. The following table provides an example of some of the differences. Security A further problem with collaboration is the challenge of providing comprehensive security. Before enterprises can collaborate effectively, the security issue needs to be addressed. There are many different facets to security in a collaborative context. Any multi-enterprise collaborative framework should address all of these different facets. The requirements for a collaborative security framework can include that: data exchanged between two partners should only be seen by the two partners; data exchanged between two partners should be tamper-proof; an enterprise should be able to verify that a partner is who it claims to be; the framework should not introduce new security holes into a partners' network; and the framework should be relatively easy to set up and administer. A secure collaborative framework can be provided by implementing a comprehensive security strategy to address the above requirements. In one embodiment, the strategy has three different aspects to it: technological security, a permissibility framework and data partitioning. Technological security can refer to the technological means used to guarantee security. This security can be used to provide: privacy, authentication and data integrity. Privacy ensures that no unauthorized person can see the data. Authentication involves authenticating that the parties in the collaboration are really who they claim to be. Data Integrity involves making it impossible for an unauthorized person to modify data being sent in any fashion. The precise security approach can vary based on the relationship type described earlier. For example, one scheme is detailed in the table below: As can be seen from the table, all of the relationship types, with the exception of Hub-to-VAN EDI, could support security via SSL 3.0. SSL 3.0 is an industry standard protocol used to support public key encryption over a socket-based connection and provides: privacy, client as well as server authentication, data integrity and certificate management. SSL 3.0 is a higher level protocol into which several public-key cryptography algorithms can be plugged including RSA and Diffie-Helman. Once the SSL handshake is complete, the next step is username-password authentication. This provides authentication beyond what SSL 3.0 itself provides. Passwords can be stored using PKCS5 password-based encryption (an RSA standard) . Once a user or spoke is authenticated, it is returned an Access Token. This access token has an administrator-specifiable lifetime. A user can then access the system for the duration of validity of the access token. This has the beneficial effect of not requiring authentication on each access. Each application which is accessed, authenticates the access token by validating the signature (which is a digest encrypted using the Security Manager's private key) of the Security Manager . The technological security framework is a portion of the security scheme. The other portion has to do with the design of the collaborations themselves. The framework should allow enterprises to easily attach permissibilities to various actions that other enterprises can perform on it. The global collaboration workspace can support a hierarchical permissibility model with individual permissibilities attached to different data elements in the hierarchy. In particular, it can support user-specific and spoke-specific read, write, take and subscribe permissibilities. Hence, enterprises can finely tune who can read what data, who can write what data, who can take what data and who can subscribe to write-notifications on what data. A third element in the collaboration framework security strategy is the ability to partition data across various collaborative workspaces. In particular, the collaborative workspaces are split into an internal collaborative workspace and an external collaborative workspace. Only data that needs to be truly shared with partners is in the external collaborative workspace. The rest is in the internal collaborative workspace. The external collaborative workspace is designed to sit either outside the corporate firewall or in an Extranet or DMZ . The collaboration framework design does not require the external collaborative workspace to make connections through the corporate firewall into the Intranet (although it could) . In one embodiment, global collaborations can use both the external and internal collaborative workspaces. Local collaborations can use only the internal collaborative workspace and are hence completely invisible to partner enterprises. Even for global collaborations only the relevant portions use the external collaborative workspace. Furthermore, because of the permissibility framework described earlier, each partner enterprise can only see (read, write, take, subscribe) to its own data. FIGURE 8 is a block diagram of one embodiment of a security configuration for a hub-to-spoke and hub-to-web case. As shown, a hub enterprise 50 is coupled to and communicates with an internal global collaboration workspace 52 and an external global collaboration workspace 54. A spoke enterprise 56 and a web enterprise 58 connect through a web server 60 to the external global collaboration workspace 54. Spoke enterprise 56, like hub enterprise 50, has an internal global collaboration workspace 62. The enterprises 50, 56 and 58 can be protected by associated firewalls, while the extranet formed by web server 60 and external global collaboration workspace 54 can be protected by a filtering router and communication via HTTP over SSL 3.0. FIGURE 9 is a block diagram of one embodiment of a security configuration for a hub-to-hub case. As shown, a hub enterprise 64 and a hub enterprise 66 can communicate across an SSL 3.0 protected TCP/IP connection. The communication can be between separate global message brokers 68 and 69. Both hub enterprises 64 and 66 are protected by a firewall, as shown. Inter-Enterprise Workflows One of the problems with multi-enterprise decision support can be that there is no closed loop collaboration. Instead, data may be lobbed from one enterprise to the next with no coherent workflow. In order to implement closed loop collaboration, support for creating multi-enterprise workflows is necessary. The present global collaboration manager and designer can make it possible to construct, deploy, monitor and change sophisticated multi-enterprise workflows . In general, a "workflow" can be a set of "activities" joined together by data flows that together accomplish some task. Workflows are typically executed on workflow engines. A "distributed workflow" can refer to a workflow that is executed on multiple workflow engines. In other words, different portions of the workflow execute on different engines. A "node" can refer the abstract entities on which different workflow engines of a distributed workflow run, and a "node group" can be a set of nodes grouped by some characteristic. A "multi- enterprise distributed workflow" can be distributed workflows where the nodes are enterprises. Parameterization of workflows can be important for enterprise collaboration. A "parametric workflow" is a workflow that is parameterized over some variable and can be regular or distributed. Instantiating the parametric workflow with different values of the parameter variable (s) produces different instances of the workflow. A "distributed workflow parameterized over nodes in a node group" can refer to distributed workflows where the parameters of the workflow are the nodes in a node group. Hence, when the workflow is instantiated it is tailored to a particular node in a node group. There are several important features to the workflows that can be supported by the present global collaboration. These workflows can be strongly typed. Strong typing can be essential in producing robust, error-free workflows. In essence, strong typing guarantees the type of a message at design time. For example, if the workflow is designed to send a Bill of Materials, then strong typing ensures that it is physically impossible that an object other than a Bill of Material is sent. For a workflow designed with the global collaboration designer and executed with the global collaboration manager, it can be made impossible to even send an object of an incorrect type. This capability is important to producing robust, error-free workflows. Despite strong typing, there are, for example, two scenarios in which wrong object types could conceivably be passed in the workflow: due to an error on the workflow designer's part; and a malicious attempt by someone to undermine the workflow. Both of these scenarios can be handled. The first can be handled by making it impossible for an error in design to lead to such a scenario. The second can be handled by making the data flows tamper-proof by using public key cryptography or other encryption scheme (integrity characteristic) as described above. Another important feature is support for workflows parameterized over groups. Some multi-enterprise workflows involve a large number of enterprises. In such cases it can become impractical to create individualized workflows for each partner. Instead it can be advantageous to create workflows that are parameterized over groups of partners. For example, in the realm of procurement, two groups may be primary suppliers and secondary suppliers. The primary suppliers group could have one type of workflow, and the secondary suppliers group could have another type of workflow. Group-based workflows can be parametric m the sense that, at run time, an actual workflow can be created specific to a member of a group. In the multi-enterprise context, an enterprise may collaborate, for example, with potentially hundreds or thousands of other enterprises. Each collaboration or multi-enterprise workflow can be potentially (and typically) unique. However, designing thousands of specialized workflows with an enterprises' partners is neither desirable nor feasible. On the other hand, many of these workflows are simply parametric variations on an underlying parameterized workflow. For example, a company A may be collaborating (on sales) with retailers, distributors, direct sales etc. Hence, it makes sense to group the various partners. An example grouping may be: WalMart; Sears; Rest of Retailers besides WalMart and Sears (group) ; Primary Distributors (group) and Secondary Distributors (group) . Now, the workflows with all the members, for example, of the primary distributors group are variations on an underlying parametric distributed workflow, parameterized over the particular distributor m that group. Workflows parameterized over groups can be supported by a HETEROCASTING workflow definition technique. The HETEROCASTING definition technique generally involves using a parameterized workflow definition to instantiate heterogeneous workflows based upon differences m the parameters. Thus, the HETEROCASTING definition technique allows a non-parametric distributed workflow to be easily (through a visual design tool) be made parametric over nodes m a node group. There can be two primary workflow activities used to accomplish this definition: a HETEROCAST split activity and HETEROCAST join activity. All activities between a HETEROCAST split and a HETEROCAST join are parameterized over the nodes of a node group that these activities correspond to. FIGURE 10 is a diagram of one embodiment of designing an inter-enterprise workflow that includes parameterization over groups. As shown, the workflow can begin with a listening activity 70 that waits for some event. Activity 70 can be linked to parallel activities 71 that links to a sub-workflow 72 and to a heterocast split 73. Sub- workflow, itself, can include a workflow definition. With respect to HETEROCASTING, the workflow after heterocast split 73 then becomes parameterized. Thus, in the example of FIGURE 10, activity 74 is a parameterized activity. After activity 74, a heterocast join 75 receives flow from activity 74. Sub-workflow 72 and heterocast join 75 are linked to a synchronous or asynchronous join 76 which, in turn, links to an integrated event 77 (e.g., multicasting). A workflow like that of FIGURE 10 can be designed using the present global collaboration designer and can allow full representation of workflow for inter-enterprise decision support. This workflow can then be instantiated and implemented through the present global collaboration manager. FIGURE 11 is a diagram of one embodiment of managing change be modifying a design of a workflow. As shown, an initial workflow design can have an event 70 linked to a parallel activity split 71. Between activity split 71 and a join 76, there can be, for example, two activities 78. This work flow, once designed, can be instantiated and implemented using the global collaboration manager. If a change needs to be made to the workflow, the global collaboration designer greatly alleviates the trouble of making the change. For example, a new activity 79 can be added between split 71 and join 76. The workflow can then be centrally remstantiated and implemented. In particular, the HETEROCAST technique can allow the construction of distributed workflows parameterized over nodes m a node group. This can allow a huge productivity gam over designing individual workflows for individual group members. Further, this technique makes rapid design and prototyping of sophisticated mter-enterpπse workflows with hundreds or thousands of partners feasible. The technique should be distinguished from conventional "multicasting" m which identical messages are sent out to the various nodes (partners). In essence, multicasting allows you to design a single workflow that runs identically across multiple nodes. This differs from the HETEROCASTING technique, where the workflows run differently based on which node they are running across. A third important feature is support for role-based workflows. Role-based workflows allow workflows to be specified using generic roles. This capability allows the creation of generic or templated workflows that can be instantiated m various scenarios. For example, the role types can be: partner roles, spoke roles; spoke group roles; web roles; web group roles; user roles. As an example of roles, partner roles refer to the different roles played by partners. Thus, one partner role m the case of procurement is primary supplier and secondary supplier. Role-based workflows can lead to the concept of three different phases m the design and execution of a workflow. The design phase is the phase m which role-based workflows are defined. The instantiation phase is the phase m which roles are mapped to instances. For example, primary supplier may be mapped to a first company, and PO approver may be mapped to John Doe. Third, the run time phase can be the phase m which the instantiated workflow runs. A further important feature is the integration of automated workflows with user-oriented workflows. Workflows can often be described as having two varieties: automated system-to-system workflows, and user interface workflows. While there are workflows that are completely automated, and there are workflows that are completely user driven, most workflows have automated as well as user interface elements. The present global collaboration manager and designer do not need to make this artificial distinction between workflow types. Hence, the workflows can be automated in parts and interact with users m other parts . Both the automated parts and user parts can span multiple enterprises. Integration w th Outside World FIGURE 12 is a diagram of one embodiment of integration of a workflow with the outside world. As described m the previous section, sophisticated lnter- and mtra-enterprise workflows can be created. These workflows can be composed of activities strung together m various configurations. There is no restriction on what the different activities of the workflow can do, yet one of the major tasks of these activities is to integrate with the outside world. FIGURE 12 shows how a workflow can be integrated with the outside world using a component-based approach to integration. The components can include accessors 80, transformations 82, transfer objects 84, adaptors and flows 86. The global collaboration manager can support a component-based integration model . The component-based integration model allows flexibility m structuring the integration. There can be two types of components: primitive components and compound components. Primitive components can include accessors 80, transformers 82 and transfer objects 84. Compound components include adaptors and flows 86. Compound components are built in terms of primitive components. In this scheme, accessors 80 are used to access an external source such as SCP (SUPPLY CHAIN PLANNER) , SAP, a relational database, web servers, email, message buses etc. Accessors 80 can be used to read, write or listen to sources and destinations of data. Transformers 82 can be used to transform data from one form to another form. Transfer Objects 84 are objects that can be passed from activity to activity or from enterprise to enterprise. Transfer objects 84 can be optionally convertible to EDI, XML, CORBA structures etc. Accessors 80 and Transformers 82 can be strung together to form flows. An entire flow can be executed in a single activity as shown in FIGURE 13. FIGURE 13 is a diagram of one embodiment of a data flow running in a single activity 92. As shown, a data source 90 can be accessible from and provide data to an accessor component 94. Accessor component 94 then can pass data through transformer components 96 and 98 which provide data to a second accessor component 100. Data can then be stored in a data destination 102. FIGURE 14 is a diagram of one embodiment of a data flow split across multiple activities 104 and 106. As shown, the flow of FIGURE 14 differs from that of FIGURE 13 in that transformer components 96 and 98 are within separate activities 104 and 106 and communicate by a transfer object. Multi-enterprise data flows can be based on the model of FIGURE 14 rather than that of FIGURE 13. With respect to transformations, in one embodiment, two fundamental transformation types can be supported: 12- CDM based transformations and direct transformations. 12- CDM based transformations are based on 12 TECHNOLOGIES' COMMON DATA MODEL (CDM) . The CDM is an abstract schema that is available in both relational and object forms. FIGURE 15 is a block diagram of one embodiment of an I2-CDM based transformation model. As shown, transformers and accessors can be coupled to transform a application data into a CDM data object 110 and vice versa. For example, a SUPPLY CHAIN PLANNER (SCP) object 112 can be created by an SCP accessor from SCP data 114. SCP object 112 can then be transformed by an SCP-CDM transformer into a CDM object 110. Analogously, an SAP object 116 can be created by an SAP accessor from SAP data 118. SAP object 116 can then be transformed by an SAP-CDM transformer into a CDM object 110. The SAP accessor and transformer, as with other accessors and transformers, can be combined into a standard SAP-CDM adapter 120 that can be used for CDM-based transformations other components. As another example, a BAAN object 122 can be created by a BAAN accessor from BAAN data 124. BAAN object 122 can then be transformed into a CDM object 110 by a BAAN-CDM transformer. These transforms work in the other direction as well. FIGURE 16 is a diagram of one embodiment of a direct transformation. In direct transformers, objects are converted from one form to another without passing through an intermediate format. For example, as shown in FIGURE 16, SUPPLY CHAIN PLANNER (SCP) data 130 can be accessed by an SCP accessor to create an SCP object 132. SCP object 132 can then be directly transformed to a FACTORY PLANNER (FP) object 134. FP object 134 can then become FP data 136 through an FP accessor. This data flow can operate in the other direction as well. In these processes, there are various levels of granularity at which access and transformation can take place including the relational (table) , generic object (tree, graph, matrix etc.) and specific object (Bill of Material, Plan etc.) levels. Sometimes access may only be available at one level (say tables) , but transformation may be more appropriate at another level (say generic object) . For example, hierarchical aggregation (a form of transformation) is often appropriate on a tree object. However, the data may only be accessible in a tabular form. In th s case, for example, the data should be accessed at the tabular level, transformed into a tree, and then have the hierarchical aggregation applied to it. FIGURE 17 is a diagram of one embodiment of different access and transformation levels. As shown, access and transformation can have three levels. A first level 140 can involve table access and transforms. A second level 142 can involve generic object (tree, graph, etc.) access and transforms, and a third level can involve specific object (build-of-materials, plan, etc.) access and transforms. In additional to transforms between application formats, there can also be transforms between the three levels, as shown. Deployment of Collaborations One important factor m a multi-enterprise collaboration system is the ease with which the collaboration can be deployed. As discussed, the present global collaboration manager can support four different kinds of partner relationships: hub-to-web, hub-to-spoke, hub-to-hub and hub-to-VAN-EDI . Of these four, hub-to-web has all the deployability characteristics of traditional web applications. Hub-to-VAN EDI can be deployable to the extent that it leverages an existing VAN-EDI infrastructure. While the hub-to-web relationship is highly deployable, it can suffer from the problem of requiring a human on the web side of the relationship. In other words, it may not be suited to system-to-system collaboration. The hub-to-spoke solution can provide maximal deployability in the system-to-system collaboration environment. In the hub-to-spoke realm, the spoke engine is analogous to the web browser, and the spoke portion of the collaboration is analogous to a web page or applet. Similar to a web-page or applet, the spoke portion of the collaboration can be centrally designed and deployed to the remote spoke engines. Unlike a web-page or applet, there may still be integration that needs to be done remotely. This remote integration may be unavoidable but can be circumscribed and precisely defined by the spoke portion of the collaboration. Another aspect of deployability is handling versioning. Collaborations once designed and deployed are likely to need changing (in various different ways) as time progresses. It can be important that subsequent versions of collaborations be as easily deployable as initial versions. The present global collaboration manager can provide complete support for versioning and centralized redeployment of collaborations. Further, different versions of collaborations can be run simultaneously without impacting each other. This allows an existing version to be gracefully phased out while another version is phased in. Another element of the deployability of the present global collaboration manager is the leverage of existing infrastructure. This element is evident, for example, in the support of the hub-to-spoke relationship over existing web protocols. Supporting hub-to-spoke over existing web protocols can be important to rapid deployment since it does not require modification or reconfiguration of an existing web infrastructure. A large time savings in this regard can come from not having to modify carefully designed firewall and security infrastructures that may already be in place. Supporting Many-To-Many Collaborations The present hub-and-spoke architecture provides easy manageability and deployment. However, in practice enterprises collaborate with many enterprises which in turn collaborate with still other enterprises. Hence, enterprises often form a collaborating web or graph. This can be supported via the ability to substitute a hub engine for a spoke engine at any time. This substitution ability allows many-to-many collaboration webs to be grown organically rather than all at once. FIGURE 18 is a diagram of one embodiment of substituting a hub engine for a spoke engine within a collaboration. As shown, an enterprise (El) may deploy a hub engine 150 on itself and a spoke engine 152 at all of its partner sites. In particular, a spoke engine 154 may be at a partner site (E2). If the partner site (E2) wishes to design and control its own collaborations, it can replace spoke engine 154 with a hub engine 156. From El's perspective, E2 can still be a spoke in El's collaboration. However, this spoke now runs on a hub engine 156 which can control its own collaborations with spoke engines 158. Further, spoke engines 160 and 162 might be associated with a third entity (E3) that interacts with both hub engine 150 and hub engine 156 on behalf of E3. Extension of Framework An important aspect of the present framework is extensibility. Without extensibility, the framework may not be able to handle new situations and challenges with which it is confronted. There can be several different dimensions to this extensibility. For example, one primary area of extensibility is in the area of semantic object standards. If supported standards do not suffice for a particular problem, then the framework can be augmented with new semantic standards. Additionally the framework allows the building of proprietary semantic standards. Further, the framework can be extended by adding new accessors, transformers, adapters, etc. The standard component library can be extended both generally and by end-users. Client Callbacks The present invention provides an improved method and system for supporting remote enterprise client callbacks as well as callbacks from internally protected regions of a single enterprise. Generally described, the present invention provides a computer implemented process for client callbacks from a workspace without the use of client-side proxy processes. As a result, client callbacks are provided without the expense associated with employing individual client-side proxy processes for each client node. Accordingly, data is efficiently shared within and between distributed nodes of one or more enterprises. FIGURE 19 is a block diagram of one embodiment of a computer workspace 200 in a computer system 205. Computer workspace 200 includes a plurality of memory slots 210 in communication with a permissibility framework 220 and an event manager 230. Computer workspace 200 is accessed by network nodes 240 via network 250. Generally, permissibility framework 220 controls access to memory slots 210 within computer workspace 200 by network nodes 240. Event manager 230 generates events to network nodes 240 m response to conditions associated with data or objects that are stored m memory slots 210. Network 250 comprises any combination or number of hubs, routers, bridges, gateways, switches, or any other association of suitable communication devices and related software that transmits data between network nodes 240. In one embodiment, network 250 comprises a network implemented independently or m connection with a wide area network (WAN) or a local area network (LAN) , such as an Ethernet network, a token ring network, or a fiber distributed data interface (FDDI) network. Network 250 supports higher level connectionless protocols such as Internet Protocol (IP), higher level connection-oriented protocols such as Frame Relay, or any other suitable networking protocol. Network 250 may be used m a multi-enterprise collaboration to implement workflows including activities that take place among or between more than one enterprise. Each network node 240 of network 250 m a multi-enterprise collaboration may be associated with a different enterprise, allowing communication and coordinated performance of activities and workflows between enterprises. Network nodes 240 may be any network endpomt, peripheral device, terminal, server, client, hub, spoke or other device connected to network 250. Each network node 240 is associated with a particular enterprise. Network nodes 240 may or may not participate m a particular workflow, activity or other process. Network nodes 240 may access workspace 200 as part of a workflow or collaboration or as part of other activities or processes not associated with a workflow or collaboration. Each memory slot 210 may store data and objects. As used herein, each means each of at least a subset of the identified items. Objects can be Java objects, C++ objects, CORBA objects, or other structures that are capable of storing both information and behavior. Memory slots 210 may be any memory structure, whether queued or randomly accessed, capable of holding data or objects. Memory slots 210 may include, for example, any data structure, hashtable or memory array. Memory slots 210 may, for example, contain a plurality of objects enqueued within memory slots 210 or may contain only a single object. Memory slots 210 may be stored to a disk or other storage medium or may be maintained in memory during any processes or activities conducted by computer system 205. Memory slots 210 maintained in memory may be stored on random access memory, for example, enhancing the speed at which their contents are accessed over memory slots 210 that may be stored to a disk or peripheral component. Memory slots 210 that are stored to a disk or other storage media are accessible at a storage media lower speed then memory slots 210 that are stored in memory but such are nonvolatile allowing for the storage of persistent data or objects. Memory slots 210 can be arranged in an organizational hierarchy defined by a programmer, user or other suitable mechanism. Such a hierarchy allows easy categorization of and reference to memory slots 210 as described below in reference to FIGURE 20. Permissibility framework 220 maintains and controls access to memory slots 210. Permissibility framework 220 may include any combination of hardware and software capable of maintaining access rights to memory slots 210 and controlling access to the slots 210 based on the access rights maintained. In one embodiment, access rights include the right of a node to: read from the contents of each of memory slots 210, write to the contents of each of memory slots 210, remove any of the contents to each of memory slots 210, and subscribe to and unsubscribe from event notification for one or more specified memory slots 210. Event manager 230 generates events to nodes 240 in response to a particular modification within memory slots 210. Event manager 230 may include any combination of hardware and software capable of generating events and initiating the routing of such events to a particular network node 240 or other suitable element of computer system 205. Network nodes 240 that have access rights to subscribe to event notification for a particular memory slot 210, as determined by permissibility framework 220, and that exercise such subscription to the particular memory slot 210, are notified by an event generated by event manager 230 each time a modification requiring notification occurs that is related to the particular memory slot 210. For example, one of network nodes 240 may have access rights to subscribe to notification for a particular memory slot 210, as verified by permissibility framework 220, and may subscribe to notification for the particular memory slot 210 each time that the particular memory slot 210 is written to by one of network nodes 240. Until the one network node 240 unsubscribes from notification for that particular slot, each time that the particular memory slot 210 is written to by one of network nodes 240, message manager 230 will generate a message and initiate the routing of such message to the one network node 240 indicating that the particular memory slot 210 has been written to. In one embodiment, access rights for subscribing and unsubscribing to event notification for a particular memory slot 210 may vary based on the classification of an event. For example, a particular network node 240 may have subscription rights to be notified whenever a particular memory slot 210 has data removed but not when the same memory slot 210 is written to, or the particular network node 240 may have subscription rights to both, or subscription may encompass notification m response to either data being removed or written m such memory slot 210. Access rights granted by permissibility framework 220 and subscription to messages from event manager 230 may also be maintained m any suitable combination. For example, event notification may be subscribed to for an individual memory slot 210, all of memory slots 210, or a subset of memory slots 210 selected based upon indicated criteria. Likewise, access rights can be granted by permissibility framework 220 to all of memory slots 210 or any subset thereof. FIGURE 20 illustrates one embodiment of the workspace illustrated m FIGURE 19. Workspace 300 is a workspace for storing data and objects m memory slots 310 that are arranged m a hierarchical framework. The exact nature of the hierarchy and the placement of particular memory slots 310 within the framework is definable by a workspace administrator, other user, or other suitable mechanism. Generally, workspace 300 is organized into sections 305 that are further separated into individual memory slots 310 and groups 320. Groups 320 may in turn contain memory slots 310 and/or be separated into further subgroups. In FIGURE 20, memory slots 310 are designated by section number, group number or subgroup number if applicable, and then designated by s and an identification number within the applicable section 305 or group 320. For example, the memory slot 310 identified by the nomenclature "section 2.groupl.s2" denotes the second slot m group 1 of section 2 of the workspace. The slot may be sequential. Other hierarchy or organizational scheme may be substituted for the hierarchy described herein. A hierarchy such as the one described allows easy categorization and grouping of memory slots 310. Such categorization can be used to easily categorize memory slots 310 for purposes of maintaining access rights. For example, a network node 240 from FIGURE 19 may only be granted a particular access right to a specific tier of memory slots 310. Such a tier may be all memory slots 310 at the group level, for example, namely memory slots 310 designated by sectionl.sl and section sectιon2.sl m FIGURE 19. Access rights may also be granted to a particular section 305, group 320, subgroup, or combination thereof. FIGURE 21 is a block diagram illustrating client and server firewalls within the global collaboration framework 360 m accordance with one embodiment of the present invention. Referring to FIGURE 21, the global collaboration framework 360 includes a server enterprise 362 and a remote client 364 connected to the server enterprise 362 by a network 366. The network 366 may be the Internet, an Intranet, or other suitable network. The server enterprise 362 includes a server firewall 370 and a server workspace 372 protected by the server firewall 370. The server workspace includes data storage 374 and a permissibility framework 376. The server workspace may be the workspace 200, workspace 300, or other suitable workspace. A register for the permissibility framework associates predefined data types 378 m data storage 374 with one or more client applications. The register may be part of the permissibility framework or other associated with the workspace. The register associates the predefined data type with a client application by allowing the client applications to subscribe to the data types. The data types may be identified by slots or other structural components of the data storage 374. The data may be data relating to the operation of a work flow or collaboration on the server enterprise 362 or other suitable information. An internal firewall 380 in the server enterprise 362 protects a client application 384 and client workspace 382 from the server workspace 372 or other hostile attacks. The internal firewall 380 allows access to the server workspace 372 from the client workspace 382 or application 384 but prevents access to the client workspace 382 from the server workspace 372. The internal firewall 380 thus allows the client application 384 to freely access the data storage 374 but blocks access from the server workspace 372 to the client application 374. In this configuration, the server workspace 372 disposed between an external firewall 370 and the internal firewall 380 may be referred to as a "DMZ." The client application 384 includes an application program interface (API) 386. As described in more detail below, the API 386 is operable to connect to the server workspace 372 to receive callbacks generated by the workspace 372. The client 364 includes a client firewall 390 and a client application 392 protected by the client firewall 390. The client firewall 390 is operable to block a client callback and other communications initiated by the server enterprise 362 for the client application 392. The client firewall 390 is operable to block the client callback in that it does not have a client-side proxy or other similar mechanism to allow the server enterprise 362 to access to the client 364 through the firewall 390. The client application 392 includes an application program interface (API) 394. As described in connection with API 386, API 394 is operable to connect to the server workspace 372. For the remote client application 392, the API 394 connects to the server workspace 372 via a proxy 396 in the server firewall 370. Once the client applications 384 and 392 are connected to the server workspace 372, the client applications may each receive a client callback and download the associated data. In this way, client callbacks are provided without client-side proxy process. FIGURE 22 is a flow diagram illustrating a method for providing client callbacks m accordance with one embodiment of the present invention. In this embodiment, the client application 392 communicates with the server workspace 372 using the TCP protocol. The method of FIGURE 22 will be described m connection with the client application 392 on client 364. It will be understood that the method may be used for local client application 384 and other client applications otherwise connected to the server enterprise 362. Referring to FIGURE 22, the method begins at step 400 m which the client application API 394 connects to the server workspace 372 via the server-side proxy 396. As previously described, the server-side proxy 396 provides access through the server firewall 370. Next, at state 402, the client application 392 remains connected to the server workspace 372 and waits for a client callback or other suitable notification from the register or other suitable element of the permissibility framework 376 or workspace 372. In response to a callback, wait state 402 leads to step 404 m which the predefined data type is downloaded to the client application 392. After the data is downloaded, step 404 returns to wait state 402. The predefined data type may be a predefined slot of the server workspace 372. As previously described, at wait state 402, the client application 390 remains connected to the server workspace 372 and waits for further client callbacks m response to the presence or appearance of the predefined data type. The client application 392 may remain connected to the server workspace 372 until the information is no longer needed by the client application 392. In this case, the client application 392 may terminate the connection with the server workspace 372 which leads to the end of the process . FIGURE 23 is a flow diagram illustrating a method for providing client callbacks in accordance with another embodiment of the present invention. In this embodiment, the client application 392 communicates with the server workspace 372 using the HTTP protocol. The method of FIGURE 23 is described in connection with the remote client application 392. It will be understood that the method may be used in connection with local client application 384 and other client applications otherwise connected to the server enterprise 362. Referring to FIGURE 23, the method begins at step 410 in which API 394 of the client application 392 connects to the server workspace 372 via the server-side proxy 396. Next, at decisional step 412, the client application 392 determines whether it has a client callback from the server workspace 372. If a callback is present or indicated, the YES branch of decisional step 412 leads to step 414 in which the data is downloaded to the client application 392. Step 414 leads to step 416 at which the client application 392 disconnects from the server workspace 372. Returning to decisional step 412, if a client callback is not present or indicated, the NO branch of decisional step 412 also leads to step 416 wherein the client application 392 disconnects from the server workspace 372. At step 418, the client application 392 waits for an interval and then repeats the method restarting at step 410 to allow the client application 392 to obtain data from the server workspace 372 with minimum bandwidth and without a client- side proxy or other similar mechanism. In this way, the present invention provides multiple access mechanisms to the workspace with no client-side proxy. If a periodic connection for callbacks is no longer desired, step 416 leads to the end of the process. Although the present invention has been described in detail, it should be understood that various changes, substitutions and alterations can be made hereto without departing from the spirit and scope of the invention as defined by the appended claims.

Claims: WHAT IS CLAIMED IS: 1. A system for providing client callbacks, comprising: a client having a client application and a client firewall operable to block a client callback to the client application from a server; the server having a server firewall and a server workspace, the server workspace including data protected by the server firewall and a permissibility framework associating a predefined type of the data with the client application; the server workspace operable to generate a client callback for the client application m response to the presence of the predefined data type; a server-side proxy operable to provide the client application access to the server workspace through the server firewall; and the client application operable to connect to the server workspace via the server-side proxy to receive the client callback. 2. The system of Claim 1, wherein the client application is operable to periodically connect to the server workspace via the server-side proxy to receive any client callback and to disconnect from the server workspace in the absence of the client callback. 3. The system of Claim 2, wherein the client application communicates with the server workspace using the HTTP protocol. 4. The system of Claim 1, wherein the client application is operable to remain connected to the server workspace via the server-side proxy and to download the predefined data type in response to any client callback. 5. The system of Claim 4, wherein the client application is operable to communicate with the server workspace using the TCP protocol. 6. The system of Claim 1, wherein the client application includes an application program interface (API) for connecting to the server workspace via the server-side proxy. 7. A system for providing client callbacks, comprising: a server including a server workspace and a client workspace separated by an internal firewall; the internal firewall operable to block a client callback to a client application in the client workspace from the server workspace; the server workspace having a permissibility framework associating a predefined type of stored data with the client application; the server workspace operable to generate a client callback for the client application in response to the presence of the predefined data type; and the client application operable to connect to the server workspace to receive the client callback. 8. The system of Claim 7, wherein the client application is operable to periodically connect to the server workspace to receive any client callback and to disconnect from the server workspace in the absence of the client callback. 9. The system of Claim 8, wherein the client application communicates with the server workspace using the HTTP protocol. 10. The method of Claim 7, wherein the client application is operable to remain connected to the server workspace and to download the predefined data type in response to any client callback. 11. The system of Claim 10, wherein the client application is operable to communicate with the server workspace using the TCP protocol. 12. The system of Claim 7, wherein the client application includes an application program interface (API) for connecting to the server workspace. 13. A method for providing a client callback through a firewall operable to block transmission of the client callback to the client, comprising: providing a server workspace having a permissibility framework; associating in the permissibility framework a predefined type of the data in the server workspace with a client application in the client; generating a client callback for the client application in response to the presence of the predefined data type; and connecting the client application to the server workspace to receive the client callback. 14. The method of Claim 13, further comprising: periodically connecting the client application to the server workspace to receive any client callback; and disconnecting the client application from the server workspace in the absence of the client callback. 15. The method of Claim 14, wherein the client application communicates with the server workspace using the HTTP protocol. 16. The method of Claim 13, further comprising: the client application remaining connected to the server workspace; and downloading the predefined data type in response to any client callback. 17. The method of Claim 16, wherein the client application communicate with the server workspace using the TCP protocol. 18. The method of Claim 13, wherein the client application includes an application program interface (API) for connecting to the server workspace.

Inventors: NOTANI RANJIT N, PARASNIS ABHAY V, WHIPPLE MARK B, NOTANI, RANJIT, N., PARASNIS, ABHAY, V., WHIPPLE, MARK, B.
Applicants: I2 TECHNOLOGIES INC, I2 TECHNOLOGIES, INC.
Application year: 1999
Main classification: G06F17
IPC codes: G06F13, G06Q10