Int 21 Fn FFBC  - Topware Network OS V5.10+ - Cancel Topshow Function      [N]

   AX = FFBCh
   CH = printer number (00h LPT1, 01h LPT2, 02h LPT3)
   CL = printer server station address or 00h for local printer

Return: AL = status (00h successful, else failed)

See Also: AX=FFBBh