Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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The network driver (as well as Windows and non-Windows applications) may
require network support software to actually carry out network requests. In
many cases, a network driver carries out a request by calling corresponding
functions in MS-DOS, the NetBIOS, or in real-mode network device drivers or
terminate-and-stay-resident (TSR) programs. Since the network driver runs in
protected mode, extra measures are required to call this real-mode software.
Furthermore, since Windows can switch between applications while network
requests are being processed, measures are required to prevent loss and
corruption of data as a result of a switch.
 
The following sections describe network support in standard- and 386
enhanced-mode Windows.
 
 
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