how to set a screen resolution

[LeVA <leva@az.isten.hu>]

Hi!

With KDE (3.5 for me) I can adjust the screen and my desktop resolution like 
800x600 or 1024x768. But this is not the same as with CTRL+ALT+Kp_add or 
Kp_Subtract, because with this method, I must scroll with my mouse cursor 
thru my desktop, and my screen stays at it's original resolution, and a 
virtual resolution gets applied with that key combination. So how is KDE 
doing this, and how can I do this without KDE (like with a command or 
something)?

Thanks!

Daniel

-- 
LeVA