Why we have computers?

Why We Have Computers

Input/Output

Because computers can display and deal with text, they offer “communication with human beings—communication that far surpasses the numeric display of the common desktop calculator. This communication is achieved through input/output, or I/O. I/O provides the basis for all the work the computer does.

Computers work by dealing with data. You put data into the computer, and it spits something useful back out, for example:

Word Processing: You input text and manipulate it by using word processing software. The computerr can save the text on disk or print the text to create a document.

Databases: You input the raw data or design a database into which others input data. The computer manipulates the data and either displays or prints the results.

Spreadsheets: You enter the calculations, the values, and the way the values relate. The computer makes the calculations and evaluations, displaying or printing the results for you.

Presentations

How Windows XP Works

You can open given computer application programs with Windows by simply finding the program you want and clicking it in the Programs menu of your ttaskbar, or by double-clicking a shortcut for the program on your desktop. Windows acts as an operating system or what many call system software. It can only allow you to run other programs. Within Windows, programs come attached as a package. For example, you have the Windows Explorer, which allows you to delete, copy, move, or rename files. Windows is set up in what is called the GUI environment, which means the Graphical User Interface environment, making it an interfacce that is much easier to use that the old DOS systems of yesteryear.

The Hardware-to-Software Interface

Windows XP interfaces the computer’s hardware with all the software you use. It’s the go-between, the manager, the traffic cop. To do the job, Windows “talks” with the computer’s hardware on the most basic, simple level.