Int 15 Fn 12  - Desqview V2.50+ - Send Message 04h With Error Recovery     [Q]

   AH = 12h
   BH = 84h

Note:  this function is identical to AH=12h/BH=04h, except that DESQview will
     not pop up a "Programming Error" window, instead returning an error
     code in AL (see #0381)

See Also: AH=12h/BH=04h,AH=12h/BX=0400h