I believe your asking how to access under a "desktop view"?
You would have to install "gnome desktop" or another thing simular to your VPS.
CentOS 5.5 with Gnome Destop,
Then with that OS template, your able to login to your Virtual Server with VNC Viewer with the session ID and access it like a desktop. People relate it to normally like Remote Desktop Connection with Windows.
What setup do you have with your VPS?
I know we have a OS that has this already pre-installed that all the client would have to do is login and type 'vncserver', and use the session id from the startup and login under vnc.
But you would need some type of component.
This is most common with Ubuntu, but I'm not 100% but I believe most OS's don't have this feature/option installed by default..
If you provide more information about your specs/setup I can assist you with steps on how to access it with all the needed things to access/use.