Cygwin is a collection of tools which provide a Linux look and feel environment for Windows. Cygwin is a DLL (cygwin1.dll) which acts as a Linux API layer providing substantial Linux API functionality. The Cygwin DLL currently works with all recent, commercially released x86 32 bit and 64 bit versions of Windows.
Version 1.7.25 allows application override of posix_memalign.
what is a license key for windows?
A product key is a 25-character code used to activate Windows and help ensure that it is not installed on more PCs than the Microsoft Software License Terms allow.
What is a PC license key?
A license key is a database that verifies access to a licensed software application. This type of software security prevents software theft. And allows organizations to protect their software from being copied or shared with unauthorized licensed users.
How do I install programs?Locate and download a .exe file.
Click on the .exe file and double-click it. (It will usually be in your Downloads folder.)
A dialog box will appear. Follow the instructions to install the software.
You will be able to install the software.