斗 长 OS Architecture ￥斗 ★★ o Multiple personality OFdesign user applications don 't call the native Windowsoperatingsystem services directly o SubsystemDLLs is to translatea documented function into the appropriate intemal (and undocumented Windowssystemservice5 OS Architecture  Multiple personality OS design – user applications don't call the native Windows operating system services directly  Subsystem DLLs is to translate a documented function into the appropriate internal (and undocumented) Windows system service calls