You can't.
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No, games need to be installed locally onto the hard drive of the computer you wish to play it from.
Tunngle for LAN or Phoenix (to install and play single player steam games) still looking into tournament MP.
Yes you can.
just get steam. it's fun and free anyway
Garry's mod 9 is free, it was the last free version. it uses steam to launch as it resource files are all valve games. you cant star gmod without steam