I have a quick question regarding Steam: I know it's possible to add non-Steam games to your Steam games list. My question is this: Does doing this give you the capability to play these games online via Steam? Let's say I have an old game (like AoE) that doesn't really have an online community any more. Can I play an online match with friends using Steam?
I know this can also be done via Hamachi, XFire and the like, but I want to test whether Steam is easier and/or more reliable to use. If it works, that is.