## Virtual Device Driver Reference for OS/2

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### Mouse-Independent Pointer Drawing Services

When the virtual video device driver creates a DOS session for the first time, it opens the virtual mouse device driver. If the open is successful, it provides the virtual mouse device driver with the following entry points :

Show Pointer
Hide Pointer
Define Text Pointer
Define Graphics Pointer
Set Video Page
Set Light-Pen Emulation

Also, whenever the DOS session changes video modes (including the initial mode change that takes place during DOS session creation), the virtual video device driver notifies the virtual mouse device driver of the new mode, the screen dimensions, and so forth.