## Virtual Device Driver Reference for OS/2

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### VDHArmReturnHook Parameter - RetHookType

RetHookType (ULONG) Return hook type.

Possible values are:

VDHARH_NORMAL_IRET
VDHARH_NORMAL_RET
VDHARH_RECURSIVE_IRET
VDHARH_RECURSIVE_RET
VDHARH_CSEIP_HOOK
VDHARH_RECURSIVE_CSEIP_HOOK

Hook routine interface:

    VOID HOOKENTRY fnarm(pRefData, pcrf)

         ENTRY    pRefData - Pointer to reference data

                  pcrf     - Pointer to client register frame

         EXIT     None

         USES     EAX, ECX, EDX, FS, GS, Flags

         CONTEXT  DOS session-task