Int 2F Fn DE03  C - Desqview V2.26+ External Dev Interface - Dv Terminati  [Q]

   AX = DE03h
   BX = mapping context of DESQview
   DX = handle of DESQview system task

Notes: driver should pass this call to previous handler before doing its work
   DESQview makes this call when it is exiting, but before unhooking any
     interrupt vectors

See Also: AX=DE02h,AX=DE0Fh,INT 15/AX=5407h