FreeS/WAN vs RealVNC

> At the last Westside meeting I was introduced to FreeS/WAN and it looked
> like a pretty cool VNC server. So I finally go to play with it and
> discover that what yum installed was RealVNC from the original team at
> AT&T labs in the UK. It also looks pretty cool and comes with free Win9x
> clients which could be a real advantage.
>
> So as anybody tried them both? Any advice on which to learn first?

I was under the impression that FreeS/WAN was a VPN protocol and VNC is a remote
desktop viewer (similar to PC Anywhere). So you would setup FreeS/WAN to allow
you remote access to your network and then run VNC to connect to a specific
machine within that network.