Window, Windows, Linux, client and server...

[Cameron Laird]

In article <1165538336.320243.22740 at l12g2000cwl.googlegroups.com>,
MRAB <google at mrabarnett.plus.com> wrote:
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>I think he wants to be able to show the server desktop on a client (for
>example, to show a user how to do something) and also be able to see a
>client desktop on the server (for example, to see whether the user is
>doing it correctly).
>
>Is there and easy way to switch between showing the server on a client
>and seeing a client on the server?
>

Now I don't understand use of "server" and "client" in this thread.
Would teleconferencing software that allows two users to see each 
others' desktops, or portions of them, suffice?  I'll also repeat:
in what ways does VNC fail to meet the requirements?