Windows Remote Desktop uses default port 3389 to send and receive data. So the first computer being accessed remotely will be assigned this port to use for Remote Desktop. While the other computers in the local area network will be assigned sequential numbers starting with 3390. So, the second computer would be given port 3390, the third would use port 3391 and so on.
For each computer you want to remotely connect to you have to configure each computer to listen to different ports to avoid port conflicts by changing the registry key in
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TerminalServer\WinStations\RDP-Tcp\PortNumber
Port Numbers are in Decimal format
Note: To avoid conflict with other programs it is suggested to select a port between 49152 and 65535.
Now take that number you've chosen your computer to listen to and configure your router to port forward to that number. PortForward.com explain how to do this. Depending on your router the procedure is slightly different, however there are great tutorials on portforward.com to explain this.
To connect to that computer your format will now be ISPIPAddress:PortNumber (ex. 222.222.2.8:1234) to connect to that specific computer behind the router
Important: If you have a firewall software running, that too has to be configured to allow communication to the port you opened in your router as well.
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