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 devices. An interoperability source or DartSource method is provided for specifying program renditions and code content and data needed for packaged interoperability application. The interoperability source extends languages constructs commonly used to specify single executable program targeted to specific device, into language and format which can also specify procedures necessary for intelligent recruitment of teams of devices and alternative renditions of the program and/or content to be used on different device platforms so that there is suitable rendition to send to run on each recruited device to carry out that device's portion of the application.