Abstract: A sharer can share an application object with a viewer over a communication network. An application can register information relating to the application object with a content manager. A listener can read the content manager to display the application objects that are available to be shared with the viewer. Upon selecting from the listener an application object to be shared with the viewer, the sharer can share the application object with the viewer.

Abstract: Languages for expressing security policies are provided. The languages comprise rules that specify conditions and actions. The rules may be enforced by a security engine when a security enforcement event occurs. The languages support data separation, dynamic evaluation, and ordered rule scope. By separating data from logic, security engines may only need to be updated with a portion of rules that change. With dynamic evaluation, expressions of rules may be evaluated dynamically, such as by querying a database, when a security engine enforces a rule. With ordered rule scope, when a security enforcement event implicates a number of rules simultaneously, the rules may be enforced in a deterministic and logically organized manner.