If, in Redhat, you can't run Xconfigurator (when typing that command, remember that Linux is
case-sensistive), then something might be wrong with your installation. However, before assuming that:
As root, type the following to find out where Xconfigurator lives on your system:
find / -name Xconfigurator
On my system (Mandrake 8.0) the program lives in the /usr/X11R6/bin directory. If the program actually does exist, try typing the full pathname when executing it from th command line. In my example, it would be:
If that works, you might want to add that directory to your PATH, so that in the future you can just type "Xconfigurator" without the fully-qualified path.