Some workstations have a mouse with two buttons, and some have a mouse with three buttons. In what follows three button mouse terminology will be used: that is references will be to the left, middle or right buttons. On a two button mouse using the ``middle'' button means using the left and right buttons simultaneously - pressing or releasing as appropriate.
Where no explicit statement is given about which button is to be used, the left button is the one.
There are two basic ways to use a mouse button. Having positioned the cursor by moving the mouse: ``clicking'' means pressing and then releasing immediately; and ``clicking and dragging'', or just ``dragging'', means pressing, holding, dragging the cursor by moving the mouse and then releasing.