Dallas, Texas-based Dallas Semiconductor Corp has introduced a new authorisation control system for distributed local area networks. With the aid of the system, which it calls Dallas SignOn, managers can control the right to use their networks centrally. Each user is provided with a small ‘Button’ that contains data. Programmed by the network manager rather than the user, the Button data replaces the password as the identifying mechanism used by the network server to authenticate requests for access. The offering is available in two parts – the S-Pak for servers and the C-Pak for clients. The server pack lists for $500 and contains two Buttons, a reader and utilities to protect files and construct the repository. Client packs cost $100 and contain one Button and reader.