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You can publicize your scalable multicasts to anyone running
a program which listens for the Session Announcement Protocol (SAP).
The SAP contains the multicast description using the Session Description
Protocol (SDP). The SDP contains the event's multicast address, port, and other information.
When SAP is enabled, RealServer creates the SDP and multicasts this
information over SAP. The Server will also collect all other SAP
messages on your network to avoid duplicate usage of the same multicast address.
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