The invention relates to a process for data exchange via a communications channel between a central unit, which processes, stores and provides data, and a data terminal device. Initially, a permanently unchanged application-independent query structure (general query structure) is stored both in the central...http://www.google.de/patents/US6430555?utm_source=gb-gplus-sharePatent US6430555 - Method and device for data transmission between a central unit and a data terminal
