And of course, with lightning comes thunder. Lightning heats the surrounding air to as much as 50,000 degrees Fahrenheit, which is five times the temperature of the surface of the sun! When air is heated, it expands, and this expansion is what's causing the sound of thunder.
Systems Software. Systems software includes the programs that are dedicated to managing the computer itself, such as the operating system, file management utilities, and disk operating system (or DOS). The operating system manages the computer hardware resources in addition to applications and data.
OpenOffice.org writer, an example of software. Computer software (often called just software) is a set of instructions and associated documentation that tells a computer what to do or how to perform a task or it can mean all the software on a computer, including the applications and the operating system. Applications are programs that do a specific thing, such as a game or a word processor.