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Joel Spolsky's company Fog Creek Software offers their "Copilot" web app type service that launches very quickly and easily and doesn't require any installation or setup on either end. For only $5, the day passes are very cost effective to use at a moment's notice.
I've used this a few times. It is no frills, but it is also almost zero-complexity. It just works, no big whoop. Exactly what I want when trying to give tech support to a tech-illiterate family member who doesn't know the difference between RAM memory and HD memory.
I wasn't aware of TeamViewer, suggested by another user here, I will definitely look into it. Note, however, that it is only free for non-commercial use, and quite pricey otherwise.
Don't forget about LogMeIn , ... which is free for non-commercial use; they also offer free noncom VPN software too which may be of help depending on your needs.
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