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There are a few specialized controllers that are specifically used for FPSs, RTSs and some arcade type games.

These controllers can be programmed to allow the emulation of keys, and macros in some cases.

These generally resemble a small part of a keyboard but may also feature other inputs such as analog sticks.

They were developed because some of these games require a keyboard to play, and some players find this to be awkward for such a task.