OpenVMS RTL Screen Management (SMG$)

This document provides comprehensive information for system and application programmers using the SMG$ facility of the OpenVMS Run-Time Library. It covers the fundamental elements of screen management (pasteboards, virtual displays, viewports, and virtual keyboards), describes various output and input operations, explains advanced features such as asynchronous event handling and subprocess management, and provides guidelines for supporting third-party terminals. The manual also includes a complete reference section for SMG$ routines and provides examples of using these routines across multiple programming languages.