Windows XP doesn't come with native tools for working with some common development tasks such as creating and applying patches. In the *nix world the tools diff and patch are standard in a dev toolbox. Cygwin will give Windows users a Linux-like command line and the ability to install a number of common Linux tools. This video will show you how to install the Cygwin base as well as diff, patch and CVS, which is the version control system that drupal.org uses for all of the core and contributed code. read more
