Windows
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![]() ![]() (Operating system) ![]() ![]() | |
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A closed source operating system. |
Microsoft Windows is a widely used closed source operating system.
Windows NT
In August 1999 Andrew D. Fernandes of Cryptonym Corporation discovered a variable in Windows NT 4 Service Pack 5 (which had been released unstripped of its symbolic debugging data) entitled "_NSAKEY".
Windows 10