VoiceView Sockets send information from an application on one computer to a corresponding application on another computer by specifying a protocol ID when setting up the connection. The specified protocol ID determines which application should receive the data.
A universal, unique identifier (UUID) identifies the specific protocol. The developer of an application assigns the UUID to that protocol (see the uuidProtocol field description of the sockaddr function in Chapter 5 for details on how to obtain and to use a UUID.)
Usually, only one application supports a specific UUID. However, if two or more applications inter-operate, they all must use the same UUID.