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NLS, short for oN-Line System, was an early computer system developed by Douglas Engelbart's team at the Stanford Research Institute (SRI) in the 1960s. It was a groundbreaking system that introduced several innovative features, including a graphical user interface (GUI), hypertext, and collaborative real-time editing. NLS laid the foundation for modern computing, influencing the development of personal computers, the internet, and the World Wide Web.