If the internal clock battery is low or missing, you would want to keep your computer turned on all the time. This would keep the system clock accurate and permit the computer to maintain its personality. Sometimes your computer is also being used as a publicly accessible server, requiring that it be turned on all the time. Always keep the power cord plugged in to the computer, even when the unit is turned off. This grounds the computer, and decreases the chance that a buildup of static electricity will occur.
Static electricity is harmful to circuits.
Those with two buttons versus three buttons. Explain the difference between the cursor and the mouse pointer. Keyboard Explain the difference from a standard typewriter keyboard. Function keys can be on the left or at the top. Numeric keypad also functions as the cursor pad.