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. Virtual pointers such as Dart VirtualPointers provide structure and method for providing a simple and efficient way to access and use of one or more independent data address spaces in a single program. Virtual pointers used by software programs can adapt their use of main memory and storage devices to run efficiently on devices with differing sizes and speeds of a fast but small main memory and larger but slower storage.