Procedure LATDIS(LUN:Integer;
                 EFN:Event_Flag
		);EXTERNAL;

{*USER*
Pascal-3 procedure to dissconnect a session and detach the lun.
The lun must first be assigned and attached before you exicute the
routine.


This procedure will perform the following operation.
- exicute a IO.HNG
- exicute a IO.DET

LUN is the logical unit number to be assigned to the appropriate device.  

EFN is the event flag to be set when the I/O is completed. f0 may 
not be specified. 

Directive status is available in $DSW on return.

}