The Globessey Data Server (GDS) is a combined data server and middleware to make information collected from different endpoints available through a standardized interface. This document describes the Global Discovery Server (GDS) functionality in the OPC UA. When compared to the LDS, the GDS provides an authoritative source for OPC UA Applications which have been verified by administrators and accessed via a. UaGDS manages the security aspects of OPC UA applications in a network. It automatically updates certificates and trust lists, improves security and reduces risk for downtime. Alternatively, the. A global distribution system (GDS) is a computerised network system owned or operated by a company that enables transactions between travel industry service providers, mainly airlines, hotels, car rental companies, and travel agencies. The GDS mainly uses real-time inventory (e.