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As in like multiplayer? No, you cannot play multiple multiplayer games on one steam account at the same time. This is not different from other platforms, where

• em-bee 3y ago
  well, i mean any games that require online access even if they are not multiplayer. i am just trying to understand how that would work. as far as i can tell there is really no reason for this not to work as long as those games don't use steam services that require an active steam login. i can run multiple steam multiplayer games in parallel on the same machine, so why shouldn't i be able to do this on multiple machines? the same as if i buy multiple games independently. steam, and any other platform is a game license manager. as steam allows me to use one license for a game on multiple machines, it should not be a licensing problem to play a different game on a different machine on the same account. i don't have steam on multiple machines so i can't test it, but what i could test is that games are able to access the network even if steam is offline. what doesn't work in offline mode is logging into games that use the steam account as identification, or that connect the game account to the steam account. but even those do seem to continue to work if the steam client goes offline after logging in. games that do not use the steam account should allow logging in even from offline mode.