## Pen for OS/2 Device Driver Reference

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### Glossary - C

C

calibration - The adjustment of a piece of equipment so that it meets normal operational standards. For example, calibration could refer to adjusting the alignment of a pen.

call - (1) The action of bringing a computer program, a routine, or a subroutine into effect, usually by specifying the entry conditions and jumping to an entry point. (I) (A) (2) To transfer control to a procedure, program, routine, or subroutine.

cathode ray tube display (CRT display) - (1) A device that presents data in visual form by means of controlled electron beams. (A) (2) The data display produced by the device in (1). (A)

child class - See subclass.

child process - A process, started by a parent process, that shares the resources of the parent process.

class - The description of a set of objects and their behavior. New classes can be defined in terms of existing classes through a technique known as inheritance.

class method - An action that can be performed on a class object. Class methods also are called factory methods.

configure - To describe to a system the devices, optional features, and programs installed on the system.

control ball - In computer graphics, a ball, rotatable about its center, that is used as an input device, normally as a locator. (I) (A) Synonymous with track ball.

CRT display - Cathode ray tube display.