Int 16 Fn FEEF  U - Pc Tools V7+ Cpsched/desktop - Installation Check      [U]

   AX = FEEFh
   CX = 0000h

Return: CX = ABCDh if PC Tools scheduler (CPSCHED or DESKTOP) installed
       BX = segment of resident portion
       DX = (CPSCHED v8.0) resident CS

Note:  this function is identical to AX=FFD3h, and is implemented by the same
     code in DESKTOP

See Also: AX=FFEFh