Int 15 Fn 12  - Topview - Send Message - "at" - Position Object Cursor     [Q]

   AH = 12h
   BH = 11h
   BL = window for which to move cursor
       00h window's handle is DWORD on top of stack
       01h task's default window
       0Ch (DV 2.26+) default window of task owning handle on top of stack
       0Dh (DV 2.26+) default window of parent of current task
   STACK: DWORD column
          DWORD row

Return: STACK popped