User's Manual

Glossary
Refresh rate
This indicates how many times per second the screen picture
is recreated. The higher this rate, the less the screen flickers.
As the human eye perceives relatively slowly, and due to a
degree of ghosting, the constant recreation of the screen
picture is no longer perceptible above a certain rate, and is
perceived as a still image. Unlike televisions with their rapid
movements and frequent scene changes (where the flickering
is not noticeable), computers most frequently display still
images and require a higher refresh rate. Many occupational
safety and standards agencies require a minimum refresh rate
of at least 75 Hz to ensure a flicker-free picture. In
comparison, the refresh rate of a television is only 25 Hz.
This value also depends on the sensitivity of the user’s eyes,
with some individuals perceiving no flicker at rates of 70 Hz,
while others perceive flickering at refresh rates up to 85 Hz.
The refresh rate for newer TFT/LCD monitors is normally 60
Hz, as the picture on these types of monitors is permanently
stable.
Registry
Also called the registry database. This is the name of the
central Windows database that contains information on all
installed hardware and software. Windows cannot function
without the registry. It should be cleaned up regularly so that
it does not become too large and slow the system down.
Remote data transmission
A collective term for the exchange of data between two
computers separated by a greater distance, for example
between an architect in New England and an engineer in
California. Data can be transmitted over the telephone
network, over the Internet or via FTP, among other options.
In local networks (LANs), the term used for this is simply
data transmission.
Resolution (graphics card/monitor)
Resolution refers to the number of horizontal and vertical
picture elements (pixels) that make up a monitor image. In
general, the higher the resolution, the more detailed the
122 TuneUp Utilities 2004