A Personal Digital Habitat is a federated multi-device information environment within which a person routinely dwells. It is associated with a personal identity and encompasses all the digital artifacts (information, data, applications, etc.) that the person owns or routinely accesses. A PDH overlays all of a person’s devices1 and they will generally think about their digital artifacts in terms of common abstractions supported by the PDH rather than device- or silo-specific abstractions. But presentation and interaction techniques may vary to accommodate the physical characteristics of individual devices.