There are some common features usually found in these systems. They also have sort and search filers that help users organize documents. They are not restricted to LANs. Because these systems use the Internet as a way of communication, their domain is the world. In web-based systems, information from the web can be used in the discussions.
Users can add URLs to messages sent to other users.
Collabra Share and Facilitate. Com are good examples. Middleware are the popular systems and most widely used. These systems can support as many as 24 million users. They posses elaborate features not found in smaller products.