## Virtual Device Driver Reference for OS/2

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### VDHPushStack - Purpose

Context Issues: This function can be called only in the DOS session-task context.

DOS Session Terminations: There are no DOS session termination implications for this function.

Notes: This is a very low-level service. Appropriate care should be exercised in its use to ensure that the client's stack is not corrupted. This service handles stack wraparound, and always returns successful when the DOS session is in V86-mode because no data accesses below 1MB can cause a fault.