A type of computer virus that compromises a feature of
DOS that enables software
with the same name, but different extensions, to operate with different
priorities. For example you may have program.exe on your computer, and
the virus may create a file
called program.com. When the computer executesprogram.exe, the virus runs program.com before program.exe
is executed. In many cases, the real program will run so users believe that the
system is operating normally and aren't aware that a virus was run on the
system.
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