ALLOWING INCOMING CONNECTION THROUGH PORT 3389 THROUGH LAN IP
I assume that you are using a LINKSYS DSL router for remote desk connection.
Go to the server/ PC where you want the remote users to let use remote desktop service make sure your windows firewall is except for 3389 port (rdp) then go to your ADSL console page and do port forwarding to the port 3389 (rdp) follow the word document attached for more info on linksys dsl router. (reset the DSL router)
Now go to cmd prompt and type ipconfig/ all and find out the public ip for example (82.33.44.55) then go to the other end pc and try telnetting (to start Run and type telnet 82.33.44.55 3389) if it is telneting that means port now open so you are done, now go to remote desktop client and type the public ip address and connect it. Type in the remote desktop enabled user name and password that?s it you are connected.
Since this IP address is dynamic ip address you will have problem remembering it always, for that I found another solution to bind the current ip address to a name, let me know once you are succeeded on this task then I will let you know.