## Presentation Device Driver Reference for OS/2

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### OS2_PM_DRV_ENABLE: Subfunction 04h - DisablePhysicalDeviceBlock - Remarks

Presentation drivers for the primary display device return a value of 0 ( zero) without taking any action.

Note: The operating system never calls this subfunction in the hardcopy driver if the driver uses one physical device block to support multiple device contexts. Presentation drivers notify the operating system of this capability by not setting bit 0 of the Logical Device flags returned to the system from the FillLogicalDeviceBlock subroutine.