operating system | Adobe Systems | BAE Systems | Cisco Systems | Android (operating system) | Catalog numbering systems for single records | Electronic Data Systems | Ubuntu (operating system) | Cadence Design Systems | Fedora (operating system) | Chief Operating Officer | Chief operating officer | Microelectromechanical systems | Marconi Electronic Systems | systems engineering | Space and Missile Systems Center | Raytheon Space and Airborne Systems | Epic Systems | Elbit Systems | Burroughs large systems | Westinghouse Rail Systems | Systems engineering | Share Our Strength | real-time operating system | Operating Thetan | Nielsen Broadcast Data Systems | Naval Sea Systems Command | Mouse Systems | International Institute for Applied Systems Analysis | Garner's Modern American Usage |
The Desktop PC operating system market is dominated by Microsoft's Windows operating system.