Hi,
I don't rember the version, which is available under redhat 9.0, but in Fedora Core it is named as vnc-server-4.0-0.beta4.3.2.
if you want to install the VNC server in your system follow the procedure.
1) check whether it is already available in your system
rpm -qa|grep vnc
2) if it is not available install using either of two options
a) put your redhat 9.0 cd's into your cdrom drive , mount the drive and go to the RPMS folder.
check vnc rpm is available in that cd or not using hte following command
ls -l vnc*
3) if it is availabel in that particular cd' --> install the rpm using the following command
rpm -Uvh <package name)
Cheers