setting site-wide default colors,fonts,... in Emacs

Help,

I have gone through the documentaiton several times,
and am not able to locate WHERE the site wide default
color scheme and default fonts are established for
any user.  I know that one can setup color schemes
in Xdefaults:Emacs... but I would like to establish
the defaults for ALL users.  Does this have to be set
at compile time? or is there a site-wide initiializaiton
file that will establish the default colors and fonts?

If you can point me where to go to find this information,
in a specific manner, I would be greatfully thankfull.

Please help me.

Frank C. Weiler
850 Quetta Avenue
Sunnyvale, CA 94087

E-Mail:  fcweiler@xxxxxxxxxxxxx
E-Mail:  frank.weiler@xxxxxxxx