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Microsoft Windows NT Workstation 40 is one of the most powerful 32-bit operating systems available for business computing today It offers the ease of use of Windows 95 along with higher performance greater reliability and better security One of the most remarkable aspects of Windows NTs architecture is that portions of the operating system--the subsystems--run in user-mode processes alongside application processes The subsystems provide the environments in which applications run The Win32 subsystem provides the application program interface API services that Win32 applications call to do useful things such as create windows and open files Applications and subsystems enjoy a clientserver relationship in which the applications are the clients and the subsystems are the servers One of the benefits of this architecture is that you can include support for other types of applications such as Unix applications to Windows NT simply by adding subsystems Much of Windows NTs renowned stability is a direct result of the operating systems architecture Applications cant interfere with one another because they run in separate address spaces Operating system code and data in the subsystems is protected from applications because subsystems too reside in their own address spaces The Windows NT Executive shares address space with running processes but its protected by the wall between kernel mode and user mode Its impossible for an application to corrupt code or data stored in the Windows NT Executive because the processor notifies the operating system of or prevents invalid memory accesses before they occur Ultimately an operating systems reliability and resistance to application-induced crashes is a function of how effectively it guards itself and the processes it hosts from other processes Windows NT excels in this regard because of the high level of protection it provides both to the operating system and to its application programs Using the NT File System NTFS is faster and much less prone to damage than the out-of-date File Allocation Table FAT used by DOS
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