one external ip-need RDC access to 2 different servers

hello everyone,
I have a client with a single static Comcast IP address.  He has two servers on his network.  He needs to RDC to either of this servers but he only has one single external static ip.
I currently configured his comcast modem to foward the rdc port (3389) to the internal ip of one of the servers.  how can I go about the second server?  does he need two external ip's?

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Set an alternate RDC port number for one of the servers, and forward it appropriately.  Then, when connecting from outside, specify the alternate port to get to the second server.

How to change the listening port for Remote Desktop

1.Start Registry Editor.
2.Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TerminalServer\WinStations\RDP-Tcp\PortNumber3.On the Edit menu, click Modify, and then click Decimal.
4.Type the new port number, and then click OK.
5.Quit Registry Editor.
6.Restart the computer.

How to configure the Remote Desktop client to connect to a specific port when you use Windows XP

To change the port number that the Remote Desktop client connects to, follow these steps:
1.Click Start, click All Programs, point to Accessories, point to Communications, and then click Remote Desktop Connection.
2.In the Computer box, type the computer name or the IP address of the computer that you want to connect to, followed by a colon (:) and the port number that you want to use.

For example, to connect to port 3390 on a computer that is named "MyXPPro," type the following information:
MyXPPro:3390To connect to port 3391 on a computer with IP address, type the following information: Connect.

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as above,
or use a product such as logmein or teamviewer
itbamiamiAuthor Commented:
that is just what I needed

I made the 2nd server listen to port 3390, configured port forwarding on the comcast router to send 3390 to the internal ip - restarted the server and viola!  RDC to 2nd server was successfull using externalIP:3390
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