## Display 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 during DOS-session creation), the virtual video device driver notifies the virtual mouse device driver of the new mode, screen dimensions , and so forth.