For most developers, working with XDebug is a simple matter of setting up the extension and getting to work. For larger teams, though, its not quite that easy. The way that XDebug is set up by default, it's no quite conducive to multiuser situations. Derick Rethans is here to help in his latest blog post, though. He describes a method (using a DBGp proxy) to handle splitting things between multiple developers.
As author of Xdebug, people ask me often the question how to handle the case in teams when there is one development server and multiple developers working on the same project on that server. [...] Now, in order to solve the above mentioned issue, you will need to run a DBGp proxy. DBGp is the protocol, designed by ActiveState and myself to facilitate communication between an IDE and PHP+Xdebug.
He walks you through the setup process - how to point XDebug to the correct location and how to configure the proxy to handle the multiple incoming requests and route the debug information back to the correct client.