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When the server is about to transmit the first MSB packet for a stream, it MUST ensure that the value of the wStreamID field in MSB packet is different from the wStreamID value that is used in the previous stream, if any. In this context, the term "stream" refers to an ASF file, or an entry, in a server-side playlist.
If the new stream uses the same ASF header as the previous stream, the most significant bit in the wStreamID field MUST be set to the opposite value of that bit in the wStreamID field that is used for the previous stream.
If the Beacon timer is running, it SHOULD be stopped (to preserve network bandwidth). However, the server MAY choose to leave the Beacon timer running.<7>