## Presentation Device Driver Reference for OS/2

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### OS2_PM_DRV_ENABLE: Subfunction 0Ch - InstallPMEngineDisplayHooks Return Value - rc

rc (LONG) - returns Return codes.

The return value is 0 if the function is successful; otherwise, it is an error value.

If the error returned = PMERR_DRVR_NOT_SUPPORTED, the graphics engine will unload the hooking DLL and work as though no routine were installed. This would be the case if the hooking DLL only handled 32-bit entry points and received a display dispatch table of 16-bit entry points.