RDC or. GoToMyPc

I have 3 users that will need access to their PC from home. I was thinking to use GoToMyPc, but I was wondering if using port forwarding in my router, it will allow the 3 of them to access their PC concurrently. Is it possible to define each user as a port so whenever I enter the WAN address:port number on the RDC screen, the router could forward that request to the specified LAN IP address? All users have static IP address.