< hardware > To press and release a button on a mouse or other pointing device . This generates an event , also specifying the screen position, which is processed by the window manager or application program . On a mouse with more than one button, the unqualified term usually implies pressing the left-most button (with the right index finger), other buttons would be qualified, e.g. " right-click ". Keyboard modifiers may also be used, e.g. "shift-click", meaning to hold down the shift key on the keyboard while clicking the mouse button.
If the mouse moves while the button is pressed then this is a drag .
(1995-03-14)