Com 226 comp trouble shooting II theory book

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The Mouse
Although the development of computer pointing devices has been ongoing since the early s, the first commercial pointing devices for IBM-compatible systems were widely introduced in the early s. The device was small enough to beheld under your palm, and your fingertips rested on its buttons. A small, thin cord connected the device to its host computer. The device’s small size, long tail-like cord, and quick scurrying movements immediately earned it the label of mouse. Every mouse needs at least one button. By pressing the button, you indicate that a selection is being made at the current cursor location. Many mouse-compatible software packages only use a single mouse button even to this day. A two-button mouse is more popular (reflecting the endurance of the mouse design) because a second button can add more flexibility to the mouse. For example, one

button can work to select an item the second button can be used to deselect that item again or to activate other menus and options. A few mouse designs use three buttons, but the third button is rarely supported by application programs, aside from CAD or high-end art applications.

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