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Pen Input

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With pen input , users write, draw, and tap on a flat surface to enter input. The surface may be a monitor, a screen, a special type of paper, or a graphics tablet.  A light pen is handheld input device that can detect the presence of light. To select objects on the screen, a user presses the light pen against the surface of the screen or points the light at the screen and then presses a button on the pen.  A stylus is a small metal or plastic device that looks like a tiny ink pen but uses pressure instead of ink.   Some mobile computers and nearly all mobile devices have touch screens that recognize pen input. Most of these devices include a pressuresensitive digital pen or stylus. Pressure-sensitive digital pens typically provide more functionality than a stylus, featuring electronic erasers and programmable buttons. Computers and mobile devices often use handwriting recognition software that translates the handwritten lett...
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Laptop, Tablets and Palmtop Computers

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The second type of computer that you may be familiar with is a laptop computer. Laptops are battery or AC-powered personal computers that can be easily carried and used in a variety of locations be a car, a taxi or airjet.    Example Laptop Computer The primary benefit of a laptop computer is its small size and easy portability . They use special screens, rather than the traditional bulky VDUs (Visual Display Units), which allows for longer battery life as well as portability. A laptop computer is sometimes called a notebook computer because of its size. Notebooks and Palmtop computers A newer term, “Notebooks”, simply indicates a VERY small laptop. These are especially popular with salespersons on the move or people giving presentations. While they tend to still be more expensive than an equivalent Desktop computer, they can now match the power of a Desktop computer. Palmtops are even smaller computers which can literally...
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Inside the system unit

The system unit is a magical box that you’ll probably never need to open. But someday, you’ll get curious about what’s inside. Inside a Computers Simplified   Inside a Computer -- Part of the Computer Motherboard How to peek Here’s how to peek inside a desktop computer’s system unit. ·   Make sure the computer’s turned off. ·   Remove the screws from the 4 corners of the system unit’s back wall. Notice how big those screws are. Remove any other screws of that size from the back wall’s edges. ·     Then remove the system unit’s cover: ·     If the unit’s a tower, pull the cover back slightly, then lift it. ·     If the unit’s a desktop, slide the cover forward — or if it refuses, try sliding the cover back — then lift it slightly. ·     If the cover doesn’t quite come off, jiggle it slightly, and also double-check whether you’ve removed all the screws holding it ...
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