Chording
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Chording means pushing several keys or buttons simultaneously to achieve a result.
The term comes from the musical keyboard, in which more than one key are pressed at a time to achieve more complex sounds, or chord (music).
Chording, with a chorded keyboard or keyer allows one to produce as many characters, as a QWERTY keyboard, but with fewer keys and less motion per finger, and is known to result lower incidence of carpal tunnel syndrome.
Mouse chording allows a user to use a two-button mouse as if it where a three-button mouse. For example, in the Unix graphical user interface (X11), the middle button is used to paste. Since many PCs have only two-button mice, chording the two buttons allows a user to paste.