## Pen for OS/2 Device Driver Reference

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### Glossary - D

D

DCB - Device control block.

debug - To detect, diagnose, and eliminate errors in programs. (T)

descendant - See subclass.

device control block (DCB) - A data structure that contains data and addresses for indirect calls for a logical device.

device driver - A program that enables the computer to communicate with a specific peripheral device such as a pen, videodisc player, or CD drive.

device helper (DevHlp) functions - Kernel services (memory, hardware interrupts, software interrupts, queuing, semaphores, and so forth) provided to physical device drivers.

device ID - A unique ID number assigned to a logical device. A device ID is unique across an entire system.

device object - An object that provides a means of communication between a computer and another piece of equipment, such as a pen or display.

digitizer - An electronic device that transmits coordinate data to software running on a computer.

display bezel - The case surrounding the display of a pen-based computer.

DLL - Dynamic link library.

double-tap - To touch a sensor twice in rapid succession within a small area.

drag - To use a pen or another pointing device to move an object.

dynamic link library (DLL) - A file containing executable code and data bound to a program at load time or run time, rather than during linking. The code and data in a dynamic link library can be shared by several applications simultaneously.

dynamic link module - A module that is linked at load time or run time.