Procedure NTSND (
	lun: Integer;
	efn: Event_flag;
	Buff: Address;
	Blen: Integer;
	VAR IOSB: IO_Status_block
	);
   EXTERNAL;
{*USER*
 
Send the contents of BUFF over logical link active on LUN. BLEN is length
in bytes of buffer, range 1..8128.
 }