Once we have a context dependent view of the world and the ability to set that context, the next thing we want is the ability to interact with services available because of our current context. For this reason we have started a project Tim Kindberg calls “Glimmer”. The challenge we address in Glimmer is the extension of a handheld client to include a variety of sensors that can interact with services dependent upon sensor data. The device and its user are nomadic: we cannot rely on preinstallation of services appropriate to our sensors, preconfiguration of services to the set of sensors, or preselection of sensors based on available services. Rather we want as wide a variety of sensors and services to emerge from actual use as people find useful.