Procedure NTXMI (
	lun: Integer;
	EFN: Event_flag;
	MSG: CH16;
	VAR IOSB: IO_Status_block
	);
   EXTERNAL;
{*USER*
 
Sends an interrupt message over the link active on LUN. The message goes
to the remote task's network data queue, and must be retrieved by the
target task via a GND call. Only one XMI message can be pending on a given
logical link at one time.
 MSG is the user data placed in the target task network data queue.
 }