Cygwin is a large collection of GNU and Open Source tools that provide functionality similar to a Linux distribution on Windows. It's a DLL (cygwin1.dll) offering substantial POSIX API functionality. Cygwin isn't a way to run native Linux applications directly on Windows; applications must be rebuilt from source to run on Windows using Cygwin. It also doesn't make native Windows applications aware of UNIX functionality like signals and ptys. The latest version of the Cygwin DLL is 3.6.0, and it's compatible with recent x86_64 versions of Windows, starting from Windows 8.1. The Cygwin project offers installation, updates, package searching, licensing information, community resources like support forums, mailing lists, and newsgroups, documentation, including FAQs, user guides, API references, and acronyms, and options for contributing to the project.
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