HTTP security

•Silverlight supports same-domain and cross-domain calls to Web services.
• Cookies and authentication are sent with all HTTP requests.
•for security reasons, Silverlight has restrictions on the types of messages that can be sent and received with HTTP.

•HTTP Communication and Security with Silverlight Describes several HTTP communication scenarios and how you can enable these scenarios.
•Network Security Access Restrictions in Silverlight 2 Describes how to use the security policy system in Silverlight and describes the policy file formats that are supported.
•URL Access Restrictions in Silverlight 2 Describes how the Silverlight runtime restricts access to certain classes of URLs.
•Making a Service Available Across Domain Boundaries Describes the mechanisms that Silverlight supports to opt-in to cross-domain access.
•Security Considerations for Service Access Describes security considerations when using Silverlight with Web services