Discount Computers

Touch screen monitor is a type of display screen that has a
touch-sensitive transparent panel covering the screen. Instead
of using a pointing device such as a mouse or light pen, you can
use your finger to point directly to objects on the screen.

The benefits of such technology are obvious. Rather than lugging
along extra input devices such as a mouse or a keyboard, the
user need only his finger to manipulate the chosen device. But
it\’s not just mobile devices that benefit from this type of
input. All kinds of devices can be equipped, including TV and
computer monitors, LCD screens, and the older CRT computer
monitors. As a result, a bartender can press on a screen to ring
up drinks on a busy night rather than type in a price, a nurse
can input patient information with one hand. Truly, the
possibilities with touch screen monitors are endless.

Touch screen monitors usually come in three varieties that
enable it to recognize a person\’s touch. These are resistive,
capacitive and surface acoustic wave. The resistive type works
by having two panels with a thin space between them. When the
user presses the screen, the two panels touch at that point, and
the exact coordinates are then registered with the computer.

A capacitive system runs a small electrical charge throughout
the touch screen. When the user touches the chosen area, some of
the electrical charge is distributed to the finger, lessening
the charge at that location. The coordinates are again recorded
and sent to the computer. This type of touch screen produces a
clearer picture because it transmits more light and doesn\’t
require two panels.

Finally, the surface acoustic wave system is the best, and
results in the clearest picture. Transducers are used to send
electrical signals across the screen, and if a user touches the
screen, they can determine where based on how the electrical
signal is received from one transducer to the other.

Since the capacitive system must have a finger to absorb
electricity, most non-living objects won\’t register as a touch.
Resistive and surface acoustic wave systems on the other hand
react to just about any form of pressure. Each has its different
advantages as a result, and manufacturers will only find new
ways to make use of them.

Finally, although touch screens provide a natural interface for
computer novices, they are unsatisfactory for most applications
because the finger is such a relatively large object. It is
impossible to point accurately to small areas of the screen. In
addition, most users find touch screens tiring to the arms after
long use.

About the author:
Willson Peterson is computer expert and network engineer. He is
the author of tml\">\”Let\’s resolve the frequent troubles of TFT
LCD monitor ourselves.\”

Click here ==> http://www.ebookarticle.com to visit his
website.

Wireless Alphabet Soup: What\’s the Difference Anyway? Michael
Knowles

You may have read a few feature lists for wireless cards, and
you\’re about to ask a very common question: what\’s the
difference anyway? Well, answering that question requires a
brief rundown of the history of wireless networking so far.

The Beginning: 802.11

Way way back in 1997 the first wireless networking standard was
released. It was simply called 802.11, without a letter after
its name. It is now sometimes called \’legacy 802.11\’ No one uses
the original 802.11 standard any more.

The 802.11 standard was never really popular to begin with, in
fact, mainly because it offered wireless equipment manufacturers
so many different choices on which parts of the standard to
implement. This left users in a situation where they were
more-or-less stuck with one set of wireless devices, and
interoperability was hard to come by.

A Breakout Hit: 802.11b

In 1999 a new revision was introduced. 802.11 became 802.11b,
and that\’s when things really started to take off. 802.11b
streamlined the standards to provide greater interoperability,
without making too many changes. Existing wireless devices were
easily upgraded to the new standard, which meant that 802.11b
wireless appeared on the market quickly.

Many advantages came with the upgrade to 802.11b. It was over
ten times faster than 802.11 (11Mbps instead of 1Mbps), and
cheaper. People loved 802.11b, and it was around this time that
wireless networking technology started to take off in a big way.

Oops: 802.11a

As a counterpoint to the 802.11b success story, consider
802.11a. The \”a\” and \”b\” standards were originally intended to
present a choice to the consumer, with \”a\” offering higher
speeds than \”b\” in exchange for reduced range. As it turned out,
though, 802.11a was an utter failure.

Why? Well, 802.11a\’s downsides were simply too great to bear.
Sure, it gave speeds of 54Mbps — almost five times faster than
802.11b — but it would only work if you had a clear line of
sight between the two wireless devices. If there\’s nothing
between the devices then, well, why not just use a wire?

As a final nail in the coffin, 802.11a products didn\’t start to
appear on the market until 2001. By then, people were used to
802.11b, and no-one was interested in getting a speed increase
in exchange for such a dramatic range decrease.

Speed With No Downsides: 802.11g

In 2003, with the lessons of the 802.11a failure learned, a new
standard was created: 802.11g. The aim of this standard was to
combine the best of both worlds, giving the speed of 802.11a
with the range of 802.11b.

Well, it was some time in the making, but they managed it.
802.11g devices run at 54Mbps, but are otherwise the same as
802.11b devices. Even better, 802.11g devices are backwards
compatible with 802.11b devices, meaning that you can use them
together in your network.

What Do I Need?

So now you know the advantages and disadvantages of everything,
but what should you choose if you\’re buying a wireless device
today?

Well, first of all, avoid legacy 802.11 (if you somehow find it)
or 802.11a. They will not work with your other wireless
equipment, and are generally quite useless.

That leaves you with the choice of 802.11b or 802.11g.
Considering that most broadband connections run well below the
speed of 802.11b (11Mbps), which you choose probably won\’t make
any difference to your external Internet access. The area where
it matters is when you transfer things around within your
network. If you\’re sending a file from your laptop computer to
your desktop one, for example, it will happen five times faster
with g than it would with b.

There is another consideration in your decision, however, and
that\’s price: g devices are still quite a lot more expensive
than b ones. If you\’re mainly planning to use your wireless
network to connect to the Internet then b will do everything you
need, but that hasn\’t stopped lots of people upgrading to g who
didn\’t really need to. This means that the market is flooded
with cheap 802.11b wireless equipment that still works
perfectly!

If you want to know the secret of wireless networking on a
budget, then that\’s it: get 802.11b equipment for a few dollars,
then sit back and watch your network work just as well as the
ones that cost hundreds.

About the author:
Post your articles for FREE on http://www.postyourarticles.com
You can even use them on your website as long as you leave them
intact. Michael Knowles http://www.freedomisyoursonline.com
Copyright 2005

I currently am the webmaster for several sites.
http://www.freedomisyoursonline.com http://www.trafficgnomes.com
http://www.postyourarticles.com I love Internet marketing and
affiliate marketing

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About the author:
John Deprice owns and operates http://www.deprice.com