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(1) An identifier that represents an object, such as a device or a window, to the Presentation Interface. (2) In the Advanced DOS and OS/2 operating systems, a binary value created by the system that identifies a drive, directory, and file so that the file can be found and opened.

A method by which two pieces of hardware, such as a personal computer and a plotter, can communicate. Depending upon the devices communicating, handshaking occurs either as a hardware function or through software, such as a device driver.

An error condition on a network that requires that the network be reconfigured or that the source of the error be removed before the network can resume reliable operation.

The array of RGBs that the physical device is displaying.

An area of free storage available for dynamic allocation by an application. Its size varies depending on the storage requirements of the application.

See hexadecimal

Pertaining to a system of numbers to the base 16; hexadecimal digits range from 0 through 9 and A through F, where A represents 10 and F represents 15.

A point in a system-defined function where an application can supply additional code that the system processes as though it were part of the function.

A sequence of hook procedures that are "chained" together so that each event is passed in turn to each procedure in the chain.