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HKEY hKey;
DWORD dwFilter[2] = {REG_NOTIFY_CHANGE_LAST_SET, REG_NOTIFY_CHANGE_NAME};
HANDLE hEvent;
RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion", 0, KEY_ALL_ACCESS, &hKey);
hEvent = CreateEvent(NULL, TRUE, TRUE, NULL);
RegNotifyChangeKeyValue(hKey,
TRUE,
dwFilter[0],
hEvent,
TRUE);
WaitForSingleObject(...);