Windows Multipoint Server is a new server operating system from Microsoft produced along the same server platform as Small Business Server 2011 Essentials. It is a Windows solutions that allow multiple users, each with their own independent and familiar Windows experience, to simultaneously share one computer, providing a low cost, easy to manage alternative solution to the traditional computing scenarios where each user has their own computer.

Here is a link that serves as a central point of information to everything else produced by Microsoft regarding Multipoint : http://support.microsoft.com/kb/2532860