1 03/20/85 cancel
 2 
 3 Syntax as a command:  cancel
 4 
 5 
 6 Function:  terminates the request that the driver is currently
 7 processing.  The request is not placed in the coordinator's saved list
 8 and thus cannot be restarted later.  This command is only valid after a
 9 quit signal, or at request command level.
10 
11 
12 Notes:  After completing the command, the driver looks for another
13 request to process.  (In step mode, it returns to command level.)