Int 15 Fn 11DE  - Desqview - Qext.sys - Installation Check                 [m]

   AX = 11DEh

Return: CF clear if installed
       AX = segment at which QEXT.SYS is located
Desc:  QEXT.SYS is Quarterdeck's HMA manager for DESQview; more recent
     versions also implement the XMS standard

Note:  a private entry point may be found by searching the beginning of the
     returned segment for the signature string
     "QUARTERDECK EXTENDED MEMORY MANAGER 286"; the word immediately
     prior to the signature contains the QEXT version number in BCD,
     and the word prior to that contains the offset within the QEXT
     code segment of the private entry point

See Also: INT 2F/AX=4310h,INT 67/AH=3Fh

Call private entry point with:
   AH = 00h ???
   AH = nonzero ???