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. Interoperability device, such as a DartDevice, provides a highly interoperable device by virtue of its running a compliant player such as a DartPlayer containing an engine such as a DartEngine and at least one communications protocol for connecting to other devices.