The PTIMERAPCROUTINE type defines a pointer to this callback function. TimerAPCProc is a placeholder for the application-defined function name.

private delegate void TimerAPCProc(IntPtr completionArg, UInt32 timerLowValue, UInt32 timerHighValue);

''' The TimerAPCProc Callback Function. An application-defined timer completion routine. Specify this address when calling the SetWaitableTimer function.

''' The PTIMERAPCROUTINE type defines a pointer to this callback function. TimerAPCProc is a placeholder for the application-defined function name.

''' </summary> Orignal C++ Line: VOID CALLBACK TimerAPCProc( __in_opt LPVOID lpArgToCompletionRoutine, __in DWORD dwTimerLowValue, __in DWORD dwTimerHighValue);

Private Delegate Sub TimerAPCProc(ByVal completionArg As IntPtr, ByVal timerLowValue As UInt32, ByVal timerHighValue As UInt32)

                        int lPeriod, TimerAPCProc pfnCompletionRoutine,