Step 1. Enable remote desktop.
Log in as an administrator account.
Right click on My Computer in the start menu and choose Properties.
Then click the remote tab. Choose "Allow users to connect remotely to this computer"
Then click Select Remote Users and add every other user that you wish to give remote access.

Step2. Open up local firewall for remote desktop
Click start and open control panel.
Choose Windows Firewall and then click the exceptions tab over there.
Check/Turn on Remote Desktop in the list.

Step3. Enable port forwarding on router.
Use the router configuration software/web interface to enable port forwarding/virtual server to the real computer.
a. Look up the local IP address of the physical computer that you wish to enable remote desktop to (run ipconfig from the command line)
b. Enable inbound TCP traffic on port 3389 to be forwarded to the ip address obtained in step a.
The configuration to set this up will be called different things on different router interfaces but look for port forwarding, virtual server, run a server or something like that.
Step 4. Test your setup
If you have another computer on the network that is the best way to test.
Try the following:
1. Try running remote desktop to the local lan ip address of the host. Obtained in (a) in step 3.
If this is not working, there is something wrong related to step 1 & 2.
2. Find out the wan ip address of the router. The router configuration software will usually tell you this. However if you're having too much trouble just access http://www.whatismyip.com
Try to remote desktop to this machine. If this does not work, something is wrong related to step 3.
3. From a computer not on your network, try to remote desktop to the wan ip address. If this works you're all set.
Links:
http://www.microsoft.com/windowsxp/using/networking/expert/northrup_03may16.mspx
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