Silverlight, a cross-platform, cross-browser implementation of the
.NET Framework for building media experiences and rich interactive
applications for the Web on desktop computers, is also available for
Windows Phone.
Silverlight includes a runtime that is optimized to
display content on memory-constrained devices. Silverlight for Windows
Phone is hosted on the client device and does not support applications
that are hosted in a browser.
for further click on the following link:
http://msdn.microsoft.com/en-us/library/ff426934%28VS.95%29.aspx