Felten was a witness for the United States government in United States v. Microsoft, where the software company was charged with committing a variety of antitrust crimes. During the trial, Microsoft's attorneys denied that it was possible to remove the Internet Explorer web browser from a Windows 98 equipped computer without significantly impairing the operation of Windows.
Citing research he had undertaken with Christian Hicks and Peter Creath, two of his former students, Felten testified that it was possible to remove Internet Explorer functionality from Windows without causing any problems with the operating system. He demonstrated his team's tool in court, showing 19 ways in which it is normally possible to access the web browser from the Windows platform that his team's tool rendered inaccessible.
Microsoft argued that Felten's changes did not truly remove Internet Explorer but only made its functionality inaccessible to the end user by removing icons, shortcuts and the iexplore.exe executable file, and making changes to the system registry. This led to a debate as to what exactly constitutes the "web browser," since much of the core functionality of Internet Explorer is stored in a shared dynamic-link library, accessible to any program running under Windows.
Microsoft also argued that Felten's tool did not even completely remove web-browsing capability from the system since it was still possible to access the web through other Windows executables besides iexplore.exe, such as the Windows help system.
Read more about this topic: Edward Felten
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