Macro key
Encyclopedia
The Macro key is a key that was featured on various early PC keyboards. It is typically found on the lower rows of the keyboard, either to the left of the "Z" key or to the right of the right Control key
Control key
In computing, a Control key is a modifier key which, when pressed in conjunction with another key, will perform a special operation ; similar to the Shift key, the Control key rarely performs any function when pressed by itself...

. While most keyboard layouts treat it as a backslash, it has a different scan code, so keyboard layouts or programs use the scan code directly, or they can choose to handle it differently.

On many new, top-of-the-line computer mice, there are built in macro keys. These mice often come with a software specifically designed to fit the needs of that mouse.

These keys are sometimes used by gamers as rapid-fire buttons, for an edge over the opponent. Using the key in a game could allow a gamer to shoot off an entire magazine of a pistol around a second. This is something that would normally take 5–10 seconds, but can be compressed megafold.

Pressing the macro key on older keyboards would often make the computer crash.
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