3.11.5 Message Processing Events and Sequencing Rules

A chat message MUST be sent on virtual channel 70 as a NULL-terminated Unicode string. The sent string MUST NOT exceed 1,024 bytes in size (including NULL termination) for versions 2 and 3 of the protocol. Version 1 can send messages longer than 1,024 bytes. Chat messages greater than 1,024 bytes are not sent by versions 2 or 3, but they can receive messages longer than 1,024 bytes from version 1 clients. There is no expected response from the receiving side.