Cerner Corporation is engaged in developing, marketing, installing, hosting, and supporting healthcare IT solutions, medical device integration solutions, remote hosting services, document management & imaging solutions, and other health & welfare services. Cerner's systems are used by individual consumers, single-doctor practices, hospitals, and various other employers across the globe. The company operates through four main segments, namely, System Sales, Support and Maintenance, Reimbursed Travel, and Services. The System Sales division offers licensed software, hardware, sublicensed software, devices, software-as-a-service, and software installations. The Support and Maintenance division offers the company's Cerner Millennium systems. The Services segment offers services such as implementation and training, remote hosting, operational management services, and revenue cycle services.