It took me a while to figure this out, but I hope it helps someone else out
there.  It is wonderful and free.

I use Fixed IPs in my network at the office.  I have a fixed IP to connect
to my ISP.  I want to use VNC viewer to access my main computers (servers
and my computer from home)  Suppose I want to access three different
computers
A. my computer at 192.168.1.3
B  my server at 192.168.1.4
C  my backup at 192.168.1.5
and VNC is already running as a service on each of these

Suppose my fixed IP to the ISP is 122.133.144.5

1 setup the Linksys router with port range forwarding like this

VNC-1   5900 to 5900   TCPIP  192.168.1.3  Enabled

This means I can now access my computer by using this in VNC viewer from
home
122.133.144.5:5900

VNC-2  5901 to 5901   TCPIP   192.168.1.4  Enabled

This means I can now access my server by using this in VNC viewer from home
122.133.144.5:5901  with one catch.
This means the port 5901 will be forwarded to my server, which means my VNC
service on the server needs to be looking for 5901.  To do this change the
settings for the server's VNC service to use display 1  (the default is 0)


VNC-3  5902 to 5902   TCPIP   192.168.1.5  Enabled

This means I can now access my backup by using this in VNC viewer from home
122.133.144.5:5902  with one catch. 
This means the port 5902 will be forwarded to my backup, which means my VNC
service needs on my backup needs to be looking for 5902.  To do this change
the settings for the backup VNC service to use display 2  (the default is 0)

You might be able to do this through the web by setting up the java ports
(5800) but I just use the 5900 and make sure I have a VNC viewer handy

Tom Gilbert 
Network Administrator 
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