Customize GNOME environment

["C.M. Wu" <manforunix yahoo com hk>]

Hello,

     I want to modify menu/panel for Gnome globally.
     For example, change default screensaver to 
     xlock. Possible point me where can I get those
     information ?

     In addition, I will write a script to reset/setup
     user desktop environment. I want to know which
     files/directory is for Gnome desktop environment
     and its function. 

     Any web sites, document recommend ...

Thanks,
Man

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