Int 15 Fn 12  - Topview - Send Message - "eof" - Get Object Eof Status     [Q]

   AH = 12h
   BH = 10h
   BL = object
       00h handle is DWORD on top of stack
       window: return TRUE if logical cursor past end of window
       mailbox: ???
       01h returns TRUE if logical cursor past end of task's def window
       02h return ??? for task's mailbox (task's handle on top of stack)
       03h return ??? for current task's mailbox
       0Ch (DV 2.26+) check log crsr of window owning handle on top of stk
       0Dh (DV 2.26+) check log cursor of window of parent task

Return: DWORD on top of stack is status