Update Notice 1

This document serves as an update notice for the VMS Workstation Software Video Device Driver Manual. The manual itself is a comprehensive guide for experienced graphics and systems programmers developing applications that interact directly with the QVSS (QBus Video Subsystem) and QDSS (QBus Device Subsystem) video device drivers on VMS Workstations. It functions as both a tutorial and a reference, detailing driver concepts, common programming tasks, and specific QIO (Queue I/O) and Drawing Operation Primitive (DOP) interfaces. Topics covered include defining and managing screen regions, handling keyboard and pointer input, customizing cursor patterns, memory usage (on-screen and off-screen), color control, viewport operations (including occlusion), and bitmap manipulation. The appendices further elaborate on data structures, writing modes, programming examples, and multinational character sets.