[CentOS] X11partioning

> I am searching for a way in X11 to "partition" or "divide" the screen.
> For example the physical size of the screen may be 1920x1080
> but what if I want 3 sections like
>
>       A
> B      C
[snip]
> Does something like that exist of X11? All this is on the same
> physical screen. Just dividing it up.

I suppose you could do something like run three vnc sessions on the
server (with appropriate -geometry settings) then vnc-viewers to each
of the servers. This is kludgey but would isolate the X sessions
somewhat.