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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