[CentOS] How do I set global proxy on a server

[moinster]

I am trying to set up a CentOS Server at my work in the lab. I can connect to the server fine from my laptop, and from the server to my laptop. But to connect to the internet we have to go through a proxy server. This requires a username and password. Is there a file where I can set a global proxy(HTTP, FTP, SSL, Gopher) so I can get the server updated and ready for it to be used in the lab environment.

Any help would be appreciated.

Thank you.