INT 21 U - Quarterdeck - QEMM-386 v5+ - GET API ENTRY POINT
        AX = 4402h
        BX = file handle for device "QEMM386$"
        CX = 0004h
        DS:DX -> DWORD buffer for API entry point
Return: CF clear if successful
            buffer filled (see INT 67/AH=3Fh for entry point parameters)
        CF set on error
            AX = error code (01h,05h,06h,0Dh) (see AH=59h)
SeeAlso: INT 2F/AX=D201h/BX=5145h,INT 67/AH=3Fh