Getting WordPress One-Click Updating to work

I’m trying to understand how to set up WordPress Auto Updating on a dedicated server.

I’ve read the page in the Codex, but don’t understand all the Apache terminology
http://codex.wordpress.org/Updating_WordPress#One-click_Update

Can someone clarify this? I can get help from the server administrator, but I would like to at least understand what I am asking for.

Many Thanks,
E