Taken From http://www.seniorscan.ca/guide/components/storage.html#s2
How a mice work
The ball on the underside is the key. As it rolls, it brushes against two
rollers set at right angles inside the mouse. These turn precisely to
reflect the mouse's horizontal and vertical motions.
The rollers are each connected to a small wheel that has slots around its
The slotted wheels rotate and alternately block and unblock light from a
diode (a device or debit that allows electrical currents to travel in one
direction only). The computer calculates the rate of the blinking light
and determines how fast the mouse is rolling in each direction. It then
adjusts the cursor to the same degree on the screen.
Most people use the mouse on a mousepad though this isn't necessary. The
pad's rubbery surface gives the ball more traction than a smooth desktop
does, however, the sponginess reduces stress on the hand.
Generally you can do a couple of things. One is to choose an item, which
can be a menu choice, an icon; or a button. You do this by pressing the
mouse's primary button either once (clicking) or twice (double-clicking).
If the unit has two or more buttons, the primary one is usually the one on
Pressing the button normally makes a distinct sound, hence the term
Clicking an option activates it just as if you had pressed Enter on the
keyboard. The software responds with another display.
You can also use the mouse to highlight something, such as text in a
document. Simply move the cursor to the beginning of a word, sentence, or
paragraph and click.
But instead of letting go, hold the button down and drag the cursor across
the text. You often can highlight something by duble-clicking it, too.
After you select an object - a shape in a graphics program, a cell in a
spreadsheet, words in a word processor - you can move it by dragging it.
Again, click the item but hold down the primary button. A highlight or
outline should appear around the item to show it is in oplay. Without
releasing the button, tow it to a new location. Let go of the button when
you have reached the designated spot. This drops the item in place, hence
the phrase "drag and drop."
You can emulate most mouse actions with the computer keyboard. Indeed,
pressing keystroke combinations is faster for tasks such as choosing menu
options. But dragging and droppingf objects is laborious with the
keyboard. If it is possible at all. A pointer is a real timesaver in a
|PS/2 Mouse Connector
||AT Mouse Connector (9 pin d-sub
Mice again have many gadgets and buttons on them the most common move
forward was the addition of a wheel between the buttons, again the most
they come in wireless and cable from. and again the most common interface
is the PS/2 connector as seen below.