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Calls the System V IPC function msgsnd to send the message MSG to the message queue ID. MSG must begin with the native long integer message type, and be followed by the length of the actual message, and finally the message itself. This kind of packing can be achieved with pack("l! a*", $type, $message). Returns true if successful, or false if there is an error. See also IPC::SysV and IPC::SysV::Msg documentation.