Understanding MS-DOS Mode
Although you will be able to run most DOS applications without any difficulties from within Windows, you may run into problems with some poorly designed MS-DOS applications—some MS-DOS applications demand total control over system resources and access hardware in the most direct way, bypassing "standard" Windows methods.
Windows 95 accommodates a poorly behaved application to the best of its capability, via MS-DOS mode. This mode is the equivalent to the Real mode present in older versions of Windows, with some "real" improvements.
MS-DOS mode works by giving the errant MS-DOS application the entire system for the duration of the session. Windows removes itself from memory, and leaves only a small "stub" loader in preparation ...
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