Tkinter invalidate?

[Daley, Mark W]

OK, I have no idea how to do this.  I want to allow a user to manipulate a
GUI while it is performing an operation in a separate thread.  I am told
what I want to do is invalidate the GUI window every time an event occurs
within it, whether it is a mouse click or the removal of a window that
overlays it.  Does anyone know how to do this?  I am looking in the os
module, but no luck yet.

- Mark