## Display Device Driver Reference for OS/2

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### Coordination of Off-Screen Video RAM

A static division of off-screen video memory is typically employed to permit access to this resource for both the Presentation Manager and seamless windows drivers. Alternatively, dynamic allocation or total dedication of the memory to one driver is used. However, these alternatives could decrease performance.

At a minimum, both the PM and seamless windows drivers' character caches are maintained in off-screen video memory for the sake of performance.