window realization

[Matt Hillebrand <hill9361 uidaho edu>]

> > 2- What exactly does "realize" mean (as in
> > widget_realize)? I've tried looking through the docs,
> > manuals and tutorials, but each time the explaination
> > just says "use this to realize the widget". No big
> > help if you don't know what it means :)
>
> There are two parts to any GTK widget: there's the data structures in your
> application's memory, and there are the resources consumed on the X server.
> Realisation is the process of actually contacting the X server and building the
> windows, colourmaps, pixmaps, etc.
>
> This is important in some circumstance because there are some operations that
> you can only do before the widget has been realised, and some operations that
> can only be done after it has been realised. They're not very common; in my
> programs, I never have to worry about it.

So what are these operations?