Can someone tell me what this means? - test-drb@ccmp.vtda.org

11 Aug 2007

...
  While Mac OS X has a UNIX layer under the hood, the
GUI is where it
 is less than compatible.  While X-Windows is available, and so can
 run UNIX GUI applications, most Mac users don't even have it
 installed.  Most Mac applications are written for the native Mac OS X
 GUI. 
While most UNIXes have X, X isn't necessary for UNIX. I have (and I 
know most people on the list probably also have) several Unices where X 
isn't included, one UNIX where X is optional (standard display is 
NeWS), and two Unices with something completely different.

I will confess to happily running Linux and OS X, and Linux makes a 
darn good can opener for assorted disks &cet. The number of different 
UI toolkits (and desktop environment support libraries/etc) that you 
wind up installing is somewhat outrageous, especially when you consider 
that many of them seem to be pretty much copying the UI of Windows.