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<HTML><HEAD><TITLE>What Is A Device Driver</TITLE>
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<H1>What Is<BR>A<BR>Windows NT Device Driver<BR></H1><A
href="mailto:dixonw@virtual.union.edu">dixonw@virtual.union.edu</A>
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</CENTER>The Windows NT operating system eliminates the need for user
applications to manage protected mode access; however, because NT is a secure
operating system, other aspects of the project were complicated. Essentially
Windows NT achieves security by restricting processes to specific address
spaces, and from preventing user mode processes from directly accessing the
physical system. In order for a user application to interface with a physical
device, it must go through a device driver. The driver is a specific application
who's sole purpose is to provide a user mode application with access to the
protected subsystem. The philosophy behind this restriction is that the device
drivers are relatively small and have a very specific purpose. The driver
consists of discrete, modular components, each having a well defined set of
functions. Hence, the device drivers tend to have fewer bugs and are more
thoroughly exercised. </BODY></HTML>
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