## Presentation Device Driver Reference for OS/2

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### Graphics Engine Internal Functions

The handling routines for these functions are in the graphics engine. Because they are not called through the dispatch table, they cannot be hooked by the presentation driver. Descriptions of these internal functions are provided. The functions are grouped according to the conditional include sections of the header file.

Each description defines what the function does, the parameters passed to the engine, and the values that the function returns.