How to change font sized

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Autore: j
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Oggetto: How to change font sized
Where would I change the font size for my display. I am running Mandrake 8.1    
The main thing is increasing the size of the letters on the screen so i can
see them better.

Changing the overall font size, would that also change the size of what I see
in VI, emacs, and NEdit ?

Thank you]

Roger