[newbie] How to change the resolution of X-windows?

[John l.yn]

Hi:

   I have two question below:

   1. I want to change the resolution of X-windows from 16 color to 24 bit
color.Help say that using 'alt'-'ctrl'-'+', but it doesnt work.

   2. The desktop is too big about 4 times than my screen of monitor. Why? I
have to move my mouse all around in order to find some thing on the screen.


Thanks!

John l.yn