INT 2F - NDOS - API
        AX = E44Dh
Note:   as NDOS is a licensed version of 4DOS v3.03, the API is identical to
          that for 4DOS, except that AH=E4h instead of D4h and the installation
          check returns AX=44EEh instead of AX=44DDh
SeeAlso: AX=E44Eh