With the Windows Live™ ID Web Authentication 1.0 software development kit (SDK) you can have a platform-neutral way to bring the power of the Windows Live ID authentication service to your own Web site.
Microsoft now introduces an easy way to integrate the Windows Live ID authentication service into your Web site!
The Windows Live ID Web Authentication SDK describes a platform-independent interface for implementing Windows Live ID sign-in on Web sites of all kinds. This release includes a sample application for each of six different programming languages: ASP.NET, Java, Perl, PHP, Python, and Ruby. For each language there is a function library that you can use to extend the sample.