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The Microsoft NetMeeting Protocol specifies a method of application sharing over the T.120 Multipoint Communication Service (MCS) layer by using the S20 MCS Channel.
The NetMeeting S20 (Application Sharing) protocol was developed before the T.128 specification became available. It is essentially the same protocol with some minor exceptions. For a detailed description of how the S20 protocol works in conjunction with the T.120 protocol set, please refer to the ITU T.128 (Application Sharing) Protocol documentation [T128-06/08].
Note: all unsigned 16-bit and unsigned 32-bit values are specified in little-endian format. The packet version and type bit fields are transferred as a single unsigned 16-bit integer variable. Depending on the hardware architectures of the client and the server, multiple-byte little-endian versus big-endian reordering can determine how this variable is marshaled by the sender and interpreted by the receiver.