nonresizable window

how can I change window properties to make it non resizable?

First of all, what windows manager are you using? (GLUT, SDL, X, WGL, etc.)
In SDL, you have the SDL_NORESIZE parameter (you’ll have to use it in the SDL_SetVideoMode). I’m sure you have something like that with the other managers.

What about GLUT?
I use GLUT but I could not see such a specification.

There is no way to do that with GLUT, directly. You’d have to frolic in the Windows API (use convoluted and unsightly workarounds).