In article main principles on-structure technological platforms from Microsoft – Silverlight 4 are considered. Existing environments for working out cross-platform appendices are analysed. The history of development of platform Silverlight is considered. The structure and possibilities Silverlight 4 on working out of interactive Internet appendices of new generation is stated.
Silverlight, RIA , WPF, XAML, Web 2.0, framework, user interface, WCF, development tools software