## Presentation Device Driver Reference for OS/2

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### DSPINSTL Service Functions

A set of standard service functions is provided to keep the action-routine developer from having to program commonly used functions. Service functions enable the user to examine and modify the DSPINSTL chain of data elements.

The global DSPINSTL data structure contains pointers to a set of DSPINSTL service functions that are available to all action routines. These service functions, listed below, are described on the pages that follow.

Link_Chain_Element
Unlink_Chain_Element
Next_Chain_Element
Select_Display_Resolutions