System, device, method, and computer program and computer program products for providing communicating between devices having similar or dissimilar characteristics and facilitating seamless interoperability between them. Computer program software and methods of and systems and devices for sharing of content, applications, resources and control across similar and dissimilar permanently or intermittently connected electronic devices. Devices, systems, appliances, and the like communicating and/or interoperating within the framework provided. An interoperability security model, method, and system, such as a Dart Security model, method and system provide an infrastructure for protecting the integrity of a device and its content from viral, other malicious, or accidental damage.