Int 15 Fn 12  - Topview - Send Message - "write" - Write String To Window  (Cont.)

   C9h force current process into background
   CAh make current window bottom-most in process
   CBh cancel current window manager operation, remove DV menu, give
       control to topmost application
   CCh orphan window and give it to the system for use as paste data
   CEh reorder windows
       DWORD pointer to null-terminated list of words
         each word is segment of object handle for a window
   FFh no operation

MODES 14h to 1Fh "USER STREAMS"
   normally NOPs, but may be defined by SETESC message to invoke FAR
   routines, one for each mode number
     on entry to handler,
       DS:SI -> first byte of actual stream (not header)
       CX = #bytes in stream
       ES:DI = window's handle

Asynchronous notification routine defined by manager stream 8Ah called with:
   ES:DI = handle of window
   DS:SI is 32-bit value set by 8Bh manager stream opcode
      mailbox contains message indicating event
         Opcode
          40h  horizontal movement
          DWORD object handle of window
          BYTE  new row
          BYTE  new col
          41h  vertical movement
          DWORD object handle of window
          BYTE  new row
          BYTE  new col
          42h  horizontal size change
          DWORD object handle of window
          BYTE  new rows
          BYTE  new cols
          43h  vertical size change
          DWORD object handle of window
          BYTE  new rows
          BYTE  new cols
          44h  scrolled horizontally
          DWORD object handle of window
          BYTE  mouse row within window
          BYTE  mouse column within window
          BYTE  field mouse is on, 0 if none
          BYTE  amount moved: >0 right, <0 left, 0 done
          45h  scrolled vertically
          DWORD object hande of window
          BYTE  mouse row within window
          BYTE  mouse column within window
          BYTE  field mouse is on, 0 if none
          BYTE  amount moved: >0 down, <0 up, 0 done
          46h  window close request
          DWORD object handle of window
          BYTE  mouse pointer row
          BYTE  mouse pointer column
          BYTE  field mouse is on, 0 if none
          47h  application's windows hidden
          48h  Help for Program selected
          DWORD object handle of window
          BYTE  mouse pointer row
          BYTE  mouse pointer column
          BYTE  field mouse is on, 0 if none
          49h  pointer message sent to window
          DWORD pointer handle which received message
          4Ah  switched to window from another ("raise")
          4Bh  switched away from the window ("lower")
          4Ch  video mode changed
          BYTE new BIOS video mode
          4Dh  Scissors/cUt selected
          DWORD object handle of window
          BYTE  row of upper left corner
          BYTE  column of upper left corner
          BYTE  field number ul corner is in, 0=none
          DWORD handle of orphaned window created with
            copy of data from specified region
          BYTE  height of region
          BYTE  width of region
          4Eh  Scissors/Copy selected
          DWORD object handle of window
          BYTE  row of upper left corner
          BYTE  column of upper left corner
          BYTE  field number ul corner is in, 0=none
          DWORD handle of orphaned window created with
            copy of data from specified region
          BYTE  height of region
          BYTE  width of region
          4Fh  Scissors/Paste selected
          DWORD object handle of window
          BYTE  row of upper left corner
          BYTE  column of upper left corner
          BYTE  field number ul corner is in, 0=none
          DWORD handle of orphaned window with data
          BYTE  height of region
          BYTE  width of region

           Note: orphaned data window should be adopted or freed
               when done
          50h  main menu about to pop up
          51h  main menu popped down

Return: all registers unchanged