//
// The following value is arbitrarily chosen from the space defined by Microsoft
// as being "for non-Microsoft use"
//
#define FILE_DEVICE_EVENTSYS      0x00008310


//
// Device control codes - values between 2048 and 4095 arbitrarily chosen
//
#define IOCTL_OPEN_EVENT   CTL_CODE(FILE_DEVICE_EVENTSYS, 2049, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_EVENT_HANDLE CTL_CODE(FILE_DEVICE_EVENTSYS, 2050, METHOD_BUFFERED, FILE_ANY_ACCESS)