Scientific Linux 4.3 + VNC

I have a pc with Scientific Linux 4.3
I want to run NVCserver while the pc is booting, before log in and after boot a session should be running.

Any ides how to do it?

Thanks in advance

 

Have a look here: http://www.tightvnc.com/doc/unix/README.txt
http://www.vanemery.com/Linux/VNC/vnc-over-ssh.html