2.1.1 Messages, Connections, and Sessions
The layout of each message that is defined by this protocol MUST extend the MESSAGE_PACKET structure, as specified in [MS-CMP] section 2.2.2.
Each message MUST be sent by using an active connection, as specified in [MS-CMP], that has been established between the two protocol participants. The mechanisms that are used to initiate and accept connections are defined in [MS-CMP] section 3.
Each connection MUST be initiated inside an active session, as specified in [MS-CMPO], that has been established between the two protocol participants. The mechanism that is used to establish sessions is specified in [MS-CMPO] section 1.3.3.1.