Formal definition of cygwin and its importance?

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Cygwin is a Linux-like environment designed for Windows, consisting of a dynamic link library (cygwin1.dll) that emulates a Linux API, allowing users to run Linux-like tools on Windows. It supports all non-beta, non-release candidate 32-bit versions of Windows since Windows 95, excluding Windows CE. However, Cygwin does not enable the direct execution of native Linux applications on Windows; applications must be rebuilt from source to function within the Cygwin environment. Additionally, it does not provide native Windows applications with UNIX functionality without recompilation.
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Can anyone tell me a formal definition of cygwin and its importance?
Your help is greatly appreciated.
 
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Might this do, you got something specific in mind ?

http://www.cygwin.com/

What Is Cygwin?
# Cygwin is a Linux-like environment for Windows. It consists of two parts: A DLL (cygwin1.dll) which acts as a Linux API emulation layer providing substantial Linux API functionality.
# A collection of tools, which provide Linux look and feel.

The Cygwin DLL works with all non-beta, non "release candidate", ix86 32 bit versions of Windows since Windows 95, with the exception of Windows CE.
What Isn't Cygwin?
# Cygwin is not a way to run native linux apps on Windows. You have to rebuild your application from source if you want to get it running on Windows.
# Cygwin is not a way to magically make native Windows apps aware of UNIX ® functionality, like signals, ptys, etc. Again, you need to build your apps from source if you want to take advantage of Cygwin functionality.
 
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