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INT 15 - DESQview 2.x - "APILEVEL" - DEFINE MINIMUM API LEVEL REQUIRED
        AX = DE0Bh
        BL = API level major version number
        BH = API level minor version number
Return: AX = maximum API level (AL = major, AH = minor)
Notes:  if the requested API level is greater than the version of DESQview, a
          "You need a newer version" error window is popped up
        the API level defaults to 1.00, and is inherited by child tasks
        some early copies of DV 2.00 return AX=0200h instead of 0002h