Setting the visual display options in X11 for GL programming

[holbromf]

Hi,
Can anyone help me set the visual display options for X11 so I can use overlays in GL using Qt. I have looked at many Google hits but am none the wiser. What line(s) do I modify in which file and how do I restart X after that please. I am using Mandrake 10.2/Mandriva 2005.

Cheers Mike

holbromf@hotmail.com