Since you revived a 3 year old post
Since you revived a 3 year old post, let's just make sure that we get some facts straight here.
Yes, you can install X11 on OS X, and yes, X11 is capable of multiple simultaneous local or remote logins. HOWEVER, this does NOT apply to NATIVE Mac OS X apps, it ONLY applies to X11 apps. So, for example, you're not going to be able to let multiple people login and use a copy of say MS Office, assuming you had all the proper licenses for doing as much. The Aqua GUI, which is what most people associate as being Mac OS X, does NOT support simultaneous users, locally or otherwise. Since this is not in the Carbon or Cocoa APIs, no native Mac OS X app will be able to support it either. Java apps might, if you figured out a way to install a second JVM for use specifically within X11.
For that matter, if you wanted to drop down to the Unix level and just
use Darwin (the OS on which the Aqua GUI runs, together comprising the
Mac OS X package) all command line apps should also be able to be used
remotely, and there should be no reason why you can't have multiple
simultaneous local or remote logins. Any app using the basic POSIX API
(which is going to be pretty much every one) should automatically gain
the Unix network transparency. But again, this will NOT apply to the
Aqua GUI or any apps written using the Carbon or Cocoa APIs. It seems
unlikely to ever change either, since you'd think that if it were going
to be added, it would have been added at some point in the last 11 or so
years of Mac OS X.
So just to recap here:
Aqua: Not possible
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