Int 2F Fn 15FF  - Cd-rom - Corelcdx - Installation Check                   [d]

   AX = 15FFh
   BX = 0000h

Return: BX = ABCDh if CORELCDX loaded

Note:  Corel's CORELCDX.COM is a replacement for MSCDEX.EXE; it also supports
     the standard MSCDEX installation check calls AX=1500h and AX=150Ch

See Also: AX=1500h"CD-ROM",AX=150Ch