INT 2F U - Quarterdeck - QEMM v5.0+ - INSTALLATION CHECK
        AX = D201h
        BX = 5145h ("QE")
        CX = 4D4Dh ("MM")
        DX = 3432h ("42")
Return: BX = 4F4Bh ("OK")
        ES:DI -> QEMM API entry point (see INT 67/AH=3Fh)
Notes:  QEMM/QRAM/VIDRAM/MANIFEST will search for a free AH value from D2h
          through FFh, then C0h through D1h
        this call is not available under QEMM v6.00 unless Windows3 support
          has been disabled with the NW3 switch to QEMM386.SYS
SeeAlso: INT 67/AH=3Fh