BeOS recognizes one-, two-, and three-button mice. By default, the left button is the first button; the right button is the second; and the middle button is the third.
A single-button mouse can simulate a two- or three-button mouse. On a PC keyboard (including a Windows keyboard), the key combinations, based on the 104-key Window keyboard, are these:
To reset the button order, adjust the timing of multiple clicks, or set the mouse speed, use the Mouse preferences.