windriver生成的XXX_lib.c程序中的XXX_RegisterEvent()函数有什么作用？

windriver生成的XXX_lib.c程序中的XXX_RegisterEvent()函数有什么作用？
源码如下：
BOOL PCI_RegisterEvent(PCI_HANDLE hPCI, DWORD dwAction, DWORD dwVendorID, DWORD dwDeviceID,
    WD_PCI_SLOT pciSlot, EVENT_HANDLER funcHandler)
{
    HANDLE hEvent;
    WD_EVENT Events;    DWORD dwStatus;

    BZERO(Events);
    Events.dwCardType = WD_BUS_PCI;
    Events.u.Pci.pciSlot = pciSlot;
    Events.u.Pci.cardId.dwVendorId = dwVendorID;
    Events.u.Pci.cardId.dwDeviceId = dwDeviceID;
    Events.dwAction = dwAction;
    dwStatus = EventRegister(&hEvent, hPCI->hWD, &Events, funcHandler, NULL);
    if (dwStatus)
    {
        sprintf(PCI_ErrorString, \"EventRegister() failed with status 0x%x - %s\\n\",
            dwStatus, Stat2Str(dwStatus));
        return FALSE;
    }
    hPCI->hEvent = hEvent;
    return TRUE;
}

windriver提供的EventRegister()的说明如下：
Register your application to receive Plug-and-Play and power management event notifications, according to a predefined set of criteria, and call a callback function upon event receipt.
我在应用程序的什么地方需要用这个函数呢？我不理会它可以吗？