Message(MSG1, MSG2, ..., MSGn), Msg(MSG1, MSG2, ..., MSGn)
Message (short: Msg) declares any identifiers as message names. These messages
can be specified as a statement sequence trigger, just like the defined
System Events SELECT, CURRENT, NON_CURRENT, ... . Furthermore, SendMsg, PostMsg or ReturnMsg can send a
message to other window objects. This exactly triggers the execution of
statements that are connected with the message.