#ifndef _NTPSAPI_H
// Threads
#if (PHNT_MODE != PHNT_MODE_KERNEL)
typedef VOID (NTAPI* PPS_APC_ROUTINE)(
_In_opt_ PVOID ApcArgument1,
_In_opt_ PVOID ApcArgument2,
_In_opt_ PVOID ApcArgument3
);
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This prototype defines the function to use as an APC routine.
Note that user APCs on the Native API level have three parameters in contrast with the Win32 APCs that only have one.