## Virtual Device Driver Reference for OS/2

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### Video Mode Tracking

The virtual mouse device driver receives notification of video mode changes from the virtual video device driver, so that the pointer size and bounds can be appropriately set.

The virtual mouse device driver must be notified of changes in the physical dimensions of the screen. It uses that information to map the raw mickeys into pel coordinates. The virtual device driver uses a device-independent interface to notify the virtual mouse device driver of mode changes so that the virtual mouse driver is capable of supporting any video device without code changes.