Windows Sockets 2 Interface Elements for Multipoint and Multicast

The mechanisms that have been incorporated into Windows Sockets 2 for utilizing multipoint capabilities can be summarized as follows:

Three attribute bits in the WSAPROTOCOL_INFO struct

  1. Four flags defined for the dwFlags parameter of WSASocket

  2. One function, WSAJoinLeaf, for adding leaf nodes into a multipoint session

  3. Two WSAIoctl command codes for controlling multipoint loopback and the scope of multicast transmissions.

The paragraphs which follow describe these interface elements in more detail.

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