Remote Desktop Fails To Connect To My PC

> Hello,
>
> I have been trying to use the remote desktop feature for awhile now. I
> have
> had success with computers that are using the same router that my source
> PC
> is on, however, once I go beyond our house and beyond our router and
> internet
> connection none of the computers I use can connect. I guess what I am
> asking
> is how to set up a remote desktop connection in vista from behind a
> Linksys
> A/B/G router. I have gone through all of the support options and
> completed
> all of the suggestions however none of them really say how to connect from
> outside a router once the source PC is setup. I have tried typing the
> PC's
> IP in but nothing happens. Any help would be greatly appreciated.