 these reasons it is hard to see how femtocells can score in this sector unless substantial subsidies are applied. Device-to-device data rates may be disappointing and dual cellular WiFi access may need to be provisioned, which would be unnecessarily complex and expensive. Outdoor to indoor coverage can also be expected to improve as network densities increase over time. Consumer M2M can be expected to include a wide variety of higher-bandwidth applications for example video sharing and lower-bandwidth exchanges including device to device telemetry and control. Handset vendors promote the logic of using the cellular phone as a control point for these devices and applications. This begs the question as to whose phone controls the house in multiphone households. We will continue to open curtains by hand rather than by phone and talking teapots will remain as at most a niche product opportunity. The case for cellular in consumer M2M remains unproven but corporate and specialist applications may provide a more than adequate market opportunity. 7 www.homeplu.org/tech/smart_energy. Network Software - Microdevices and Microdevice Networks - The Software of the Very Small This is a chapter about very small things and the software that drives them. This includes very small things that when interconnected can become very large networks. In previous chapters we have discussed the evolving role that microelectrical mechanical systems are playing in cellular handset design and beyond that the role that nanoscale manufacturing may have in transforming material properties. The combination of silicon geometry scaling and microminiaturisation techniques together are transforming phone form factor and functionality. There are, however, other devices that are acquiring new capabilities and shrinking both in size and the amount of energy they consume. These devices use manufacturing techniques at the scale of nanometres (one billionth of a metre) to build structures at atomic or molecular level that are combined in to devices that a