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The keyboard sends the key code to the keyboard driver running in the main computer; if the main computer is operating, it commands the light to turn on. All the other indicator lights work in a similar way. The keyboard driver also tracks the shift, alt and control state of the keyboard.
A wireless keyboard must have a transmitter built in, and a receiver connected to the computer's keyboard port; it communicates either by radio frequency (RF) or infrared (IR) signals. A wireless keyboard may use industry standard Bluetooth radio communication, in which case the receiver may be built into the computer.
Mechanical test includes seeking and servo on data tracks. Scans small parts of the drive's surface (area is vendor-specific and there is a time limit on the test). Checks the list of pending sectors that may have read errors, and it usually takes under two minutes.
External wireless modems include connect cards, USB modems, and cellular routers. Most GSM wireless modems come with an integrated SIM cardholder (i.e. Huawei E220 , Sierra 881.) Some models are also provided with a microSD memory slot and/or jack for additional external antenna, (Huawei E1762, Sierra Compass 885.) [ 62 ] [ 63 ]
The density of water is the reference value for specific gravity; water is defined to have a specific gravity of 1. ‣ ᓛᖁ ᑐ 00:01, 2 December 2005 (UTC) [ reply ] December 2
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