Depending on the version of the browser used, information including E-mail address and previously visited pages can be obtained by the server. The primary purpose of this data exchange is to obtain information about the helper functions and capacities of the client machine to accept various images. This illustrates the interaction between privacy and service. Even with protection from disclosure of browsing information, if the computer user is using a single user machine that supports finger daemons, then the server can still obtain computer user identity. For more effective communications, clients can send information on available helper applications to servers.
Helper applications offer probabilistic information about the consumer's machine and even interests.
For example, the number and variety of helper applications, presence of shareware or freeware applications, and the presence of advanced helper applications, together, imply a level of user technical sophistication. After sending a request command from the http server, the client will send an accept command. The computer user will not know the granularity of data sent. Once connected to a Web site, the site may track the user's actions including every mouse click, and time spent considering each electronic view. Anonymity, reliability and security are mutually compatible.