Currently, there are approximately 80 API functions pertaining to security in Windows NT (excluding the crypto API functions), and only a handful of these are fully or partially supported under Windows 98. Of course, as is standard in other areas of the Win32 API, any Windows NT security functions not supported by Windows 98 will at least have function stubs located in an appropriate DLL, so your Windows NT application can load on a Windows 98 system without linking errors. Therefore, when you are designing an application to make use of Windows NT security, it is your responsibility to determine what functionality this application should provide when running under Windows 98—if indeed it should even be permitted to run at all.