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RDP (remote desktop protocall) is perfectly routable, and works fine from a remote connection. there is a good chance the provider blocks the ports if their administrators use it themselves, thereby blocking everyone but them from using it on their own network resources.
another stopping point might be that somewhere between your 2 connections is a proxy or NAT that either provider may be using. DSL providers are probably some of the worst for using "transparent" proxy servers or NAT implimentations that make all of their subscribers in a single area look like they are comming from one ip address. i know that some dial up providers even do this for end user security reasons, which ends up giving problems with things like msn or yahoo messenger file transfers as well.
you may want to see if you can successfully trace route to the computer from your own machine first, and see where the router thinks the packets are going to. REAL VNC is a great freeware remote desktop tool that will allow you to specify server ports, and tends to work much more smoothly than RDP.
finally, if the person is using XP, make sure their XP firewall is either accepting RDP or whatever ports for incomming connecitons, or else that it is disabled completely.
good luck!
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