What do you want to know about it? I've been using it for several years now, although I usually only use it to remote control Windows machines (don't need it for *NIX machines). Basically you have to install the VNC server on the machine you want to control and then you can remote control it from either the VNC client or from any web browser.
Or do you want to set up the vncserver on a *NIX box? Which you *can* do but like I said, I prefer not to. If you have VNC properly installed on your *NIX box you would start the server by typing "vncserver :1" which should prompt you for a password to be used by the client. On the client you would enter "servername:1" to connect to the server (or in the web browser you would use the url "
http://servername:5801"). On Windows servers you would use ":0" or "5800" as the port. UNIX you can use any number ":1", ":2", ":3", etc and "5801", "5802", "5803", etc for the browser, but it must match between client and server.
See "man vncserver" for more info...