Int 16 Fn FFC1  U - PC Tools V5.1-8.0 Desktop - ???                        [U]

   AX = FFC1h
   BL = ???
   ES:DI -> data structure (see below)
   ???

Return: AX = ???

Note:  available only when popped up

See Also: AX=FFC2h,AX=FFC3h

Format of data structure:
Offset Size    Description
 00h   WORD    ???
 02h   WORD    ???
 04h   WORD    ???
 06h   WORD    ???
 08h   WORD    ???
 0Ah   BYTE    ???
 0Bh   BYTE    ??? (zero/nonzero)
---v7.1---
 0Ch   WORD    ???
 0Eh   BYTE    ???
 0Fh   WORD    ???
 11h   WORD    ???
   ???