Xvnc with inetd

Here's how to use Xvnc with inetd to allow users to use a VNC client to get to an xdm:

http://www.realvnc.com/products/free/4.1/man/Xvnc.html#lbAG

As RHEL 5 uses xinetd I created '/etc/xinetd.d/Xvnc' with the following contents:

# default: off
# description: Xvnc server which talks XDMCP to a local xdm in order
# to give the user a local GUI login prompt.
service Xvnc
{
disable = no
port = 5900
socket_type = stream
wait = no
user = nobody
server = /usr/bin/Xvnc
server_args = -inetd -query localhost -once securitytypes=none
log_on_failure += HOST
}

GNOME's vino might also be of interest but it's designed for connecting to running GNOME sessions.