Can I make a gtk app without the titlebar, nor the border.

[Zenith <zenithlau sniic com>]

Whenever I app start, window manager will give this program a border and a title bar to this program.
Can I disable it??
Is there any gtk function calls can solve my problem.

I have heard from someone that, I can use a xlib function, but I am not sure.
Anyway, any means can solve it is very helpful for me ^^

Zenith