## Display Device Driver Reference for OS/2

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### Code Modifications Required in Base Driver for DCAF

The majority of the new code is contained within new modules that are simply linked with the base driver. The areas of the base driver code that must be modified include the following:

The Dispatch Table, which contains the new Entry Points

All drawing functions, which contain extra tests to determine whether they should accumulate clipped screen bounds and, if necessary, code to calculate the clipped bounding rectangle

Seamless Windows cursor exclusion code, which is modified to call the new bounds accumulation routine.