More importantly, advances in technology are expected which will greatly improve general purpose PDAs . Cheap and compact colour displays , required for PDAs with fax and Internet capability, are expected to become available. Microsoft has announced the Windows CE operating system. Compatible with Windows 95, it will allow third party developers to produce PDA software. Target devices include cellular phones, PCS, pagers, and PDAs.
Systems are under development in North America, Europe, and Japan.
In-vehicle sensors to survey traffic and obstacles around the vehicle will be required to warn the driver, and, perhaps, take over control of the car to some degree. Frequencies near 60 and 77 GHz are being considered. Now that defense expenditures have been sharply reduced, North American manufacturers of GaAs-based MMW radar for smart munitions will no doubt become active in vehicle radar. The system will involve about 20 airships at a height of 20 km. The system would be less prone to damage due to natural disasters than terrestrial systems.