User Guide

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User’s Guide
remains in the listen state as long as one or more un-connected connection
objects exist for the listen endpoint.
A TCP session is terminated when either end of a connection performs a
disconnect operation.
3.2 UDP
UDP provides for unreliable, connectionless communications. It also allows
for broadcast capability. A UDP session is initiated when a process creates a
UDP endpoint. As for TCP endpoints, the process can either explicitly assign
a port number or let the TCP/IP stack assign one. The address format is the
same as for TCP.
Since UDP is connectionless, a process does not need to establish a
connection before sending or receiving messages - it can immediately begin
sending and receiving messages. However, it must specify the address/port-
pair whenever it sends (the remote address/port-pair is defined by a
connection for a TCP send).
A UDP session ends when a process closes its UDP endpoint.
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