Ram memory after many days

[gustavo halperin <ggh.develop@gmail.com>]

Hello

I commonly use the next applications: Mozilla,  gnu-emacs, gv, xpdf and 
many xterminals.
The problem is that after many days without restart the system the 
memory grow a little more any day
and after aprox. 20 days I have all my 775MB occupied by the system and 
even if I close all
the applications the memory occupied still the same, just reboot the 
system free this memory.
My question is how release the memory that is not in use any more?

Thank you in advance

 Gustavo Halperin

By the way, I'm using Debian Sarge with MW Enlightenment  without KDE or 
Gnome