How work with game window?

[Zizianaton]

Hello everyone! How i can work with game's window?
I want to change (for example) game window size, position, etc.
How can i do it?
i want to use it in situation like this:

[raw]"Window position will change."
#do something with window position.
"It is changed?"[/raw]

(My English sucks, yeah.)