Int 2F Fn 48C3  - PCed/keydef - Installation Check                         [K]

   AX = 48C3h
   BL = 00h

Return: AX = 0000h if installed
       BX = KEYDEF resident segment
Program: KEYDEF is a resident keyboard redefinition utility included as part
     of the PCED package

Note:  chains if BL <> 00h on entry

See Also: AX=48C0h,AX=48C2h,AX=48C4h