I'm doing some research on CMS's and I was curious to know how a Moodle server handles multiple users logged in one time. Does it run in multiple instances on a single server (such as each logged in user is working in a separate instance of Moodle), or does it use a thread safe framework like Merb which just creates a new thread for each individual user. Any help would be greatly appreciated, thank you.
It uses PHP on top of apache or another web server.