How to work remotely as a multiuser enviroment on Xcode, deployed on a Mac mini server
I'm not sure that Xcode Server provides that functionality. Xcode Server (part of macosx server)  is a continuous integration solution, which means that your developers work on their own machines with their local tools and push code to a repo accessed by the Xcode server, which builds &amp; tests the newly submitted code.

see Xcode Continuous Integration for a far better explanation of the workflow.

I don't know of any solution (other than vnc/screen sharing) that will allow you to share the Xcode app on the server between multiple users.