Yep, I'm using this on my proxies:
So when I update file.php in the public_html it auto-updates every website (this code is thanks to dtkguy if I remember well :D)Code:<? include("/home/*cPanel Username here*/public_html/file.php"); ?>
I'm using this for:
Proxified page (a banner that is currently there, if I sell that banner I can update it with one single click on all proxies)
Topsites links (a new toplist -> just add it to that file and add all sites to that list :D
Google Adsense (If I want to try new formats, I can change it via one file)
And it's all working pretty well for me :D

