Look in your registry for a hive called P2P.
It's nothing suspicious.
They said last year sometime that they were investigating ways of implementing a P2P system for Steam users, but the biggest hurdle they have is doing so and not opening themselves up to copyright infringement lawsuits from 3rd party companies.
Steam already has the functionality but it is not currently enabled.
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Grand Theft Auto IV.....what else is there?
PSN ID= Puscifer73
"Blues News" Steam Community...
http://steamcommunity.com/groups/bluesnews/