The Application reference article from the Simple Wikipedia on 24-Jul-2004
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The word application has several uses.

In medicine, application means putting some drug or ointment usually on the skin where it is absorbed into the human body.

When dealing with computers, an application is a type of computer program. At the direction of some user, perhaps set up once and executed many times, this performs a well-defined mathematical or communications function, or retrieves information, or displays or edits a document. How well this works depends not only on the code of the program, but also on the operating system and physical attributes of the computer such as how fast its processor is and how much memory is available.

Physically, the bits making up the application can be on the boot device or a data device, or a device of their own. Usually, some basic applications like a text editor, file browser and telnet do go on the boot device to be sure that they are always available even if only the boot is accessed. If the bits are on a non-boot device, they may not always be found when required. In Windows the user may be asked to find the application which is required to process a document type.

Common types of applications available free of charge include web browsers, email programs, and instant messaging software.

In business or government, an application is a (usually paper) form filled out and handed in by a person seeking a privilege from a state or company, such as work, credit, some type of license or permit, or a place to live.

At work, when dealing with certian materials or objects, an application is a purpose you can use that material or object for. Wood and steel have many applications.