Project managers use Microsoft Project Professional connected to Microsoft Project Server to define their project schedules.
One of the major design characteristics of Microsoft Project Server is that until project managers want to make their schedules available for review by other people in the organizations they simply “Save” their schedules. When their schedule is complete, they “Publish” the schedule. The act of Publishing makes the project schedule, work and task resources visible to the other people in the enterprise, based of course on them having the appropriate security permissions.
Published schedules can be viewed using Project Web App (PWA) which is the Internet Explorer-based component of Project Server