>>Why not use Remote Desktop Connection which comes with XP? Program->Accessories->Communications
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>Does that require someone to be present at the other end? Sometimes I need to do things after-hours when their system is not active. Is security an issue? Both GoToMyPC and LogMeIn have encryption and operate thru secure servers. Firewalls don't seem to be an issue with the services.

Nobody need to be present on the remote end, but it must be set up as a "host". I use it daily to get access to my office PC when I'm home. About encryption and so on, I donæ' know, but I guess you will find more info at MSFT website.