X little tricks

Dru Lavigne has an article on "Fun with X.org" and looks at some cool stuff u can do with X.
I'll read about
some of the capabilities b4 but not seen easy 2 follow screenshots that makes it easier 2 understand.

• add in support 4 DRI (Direct Rendering Interface), DRM (Direct Rendering Manager), OpenGL (OPEN Graphics Library) as doesn't come by default from x.org
  
• multiple window managers simultaneously
  
• pread a single display across multiple monitors using DMX
• Monitor Other Systems