What operating systems constitute three desktop operating systems?

What are the four voltages produced by an AT power supply? Modern applications change frequently-before they are presented to the end-user and then after the first version has been put into use suggest a few ways to build to stop deterioration due to change? Application software that helps users organize personal information? Which is a function of the show ip route command when used as a tool for troubleshooting network connectivity? What does excel automatically do to complete the average function when you click the enter box or press the enter key? Does a hard disc spin all the time? How do you copy a letter? What is the need for safe storage and efficient retrieval of information? Computers at the cheapest prices and the highest specifications? When was the apple mac introduced? What uses multiple wifi access points to create a wide area network? What is a system preparation tool? You have lost your windows XP software that came with your computer if you replace your hard drive will you have to buy another soaftware disc from microsoft. If not how do you do this? What is the halfway mark between Idabel Oklahoma and crescent Oklahoma? How do you adjust your screen resolution in windows to 1366x768? What does word automatically creates a hyperlink to? Do LCD monitors use a digital signal to produce a picture? What is the prices of the memory modules for iB171A? How many gallons of water are in an oval 15' x 26' x 54 swimming pool? What is the difference between the commands compress and pack?