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Tag mode is a mechanism to locate other players of a particular Nintendo DS game while not playing the game. Most games that support tag mode use the Nintendo Wi-Fi Connection in some way as well (usually to generate the unique friend code keys). Tag mode works by having the player turn it on after setting up an ID. The the player is free to close the DS (putting it into sleep mode while still broadcasting it's ID) and proceed about their business. At any point a player may open their DS and see if they have found another player. If they did, then they get to play wireless, without a hook to connect.
