Steam is very useful thing, not only DRM, it is:
- global server list (filters, sorting by, and more more etc)
- auto-update (download and install lattest patch automaticly)
- social network (groups, friends and etc.);
- chat (easy chating from in-game, voice chat, messages like ICQ, MSN);
- achivements (military ranks, medals and awards, and etc.)
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