Int 2F Fn DE0B  C - Desqview V2.26+ External Dev Interface - Dvp Processi  [Q]

   AX = DE0Bh
   BX = mapping context of DESQview system task
   CX = number of system memory paragraphs required for the use of all
         XDI drivers (DV will add this to system memory in DVP buffer)
   DX = handle of DESQview system task
   SI = mapping context of new process if it starts
   ES:DI -> DVP buffer

Return: CX incremented as needed

Notes: once DV invokes this function, the DVP buffer contents may be changed
   driver should pass this call to previous handler before processing it