[Tkinter-discuss] How to detech change of variable state in Tk?

[Snakey]

I have written a Tk GUI that upon pressing a button, will launch a subprocess
to open a dos-box "cmd.exe".

I need the GUI to monitor the returncode of this subprocess, so that when
the dos box closes with return code 0, a subroutine can be executed to
handle this event.  BUT while the dos box is open, the GUI must still
monitor all other events in mainloop() ( ie. GUI cannot hang ).

snipplet of code:  >>>

import subprocess
s= subprocess.Popen( 'cmd.exe' )

# s.poll() ???
	

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