Int 2F Fn CB09  - Communicating Applications Specification - Delete All F  [F]

   AX = CB09h
   DL = queue
       00h delete all control files in task queue, including all group
         files
       01h delete all files in receive queue
       02h delete all control files in log queue, including all group
         files

Return: AX = 0000h successful
   AX < 0     error code (see #2720)

See Also: AX=CB08h