How do I connect behind a router?

[J M]

I am trying to connect to a remote machine that is
behind a router.  After installing winvnc it says the
IP Address is 192.x.x.x.  This tells me it is wrong. 
Whatsmyipaddress.com gives a good IP Address.  How to
I get winvnc to listen on the right IP Address?

The DSL modem has the 192.x.x.x IP Address.  I am
trying to figure this out in my head, so sorry if it
is confusing.

The modem has 192.x.x.x this maps to what that has the
68.x.x.x ip (the router?)  Am I correct the router
(68.x.x.x) knows how to route to 192.x.x.x?  Thanks
for any help.

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