License requirements for System Architect XT and System Architect XT Web Service
System Architect XT does not support node-lock licensing. You must use a license from a License Server because System Architect XT limits the number of user sessions that it runs based on the number of licenses that you have purchased. A License Server is required to keep count of the number of licenses in use at any one time.
On the System Architect XT login page, you select your login mode: “Reader” or “Updater”.
▪A Reader uses one “SA-XT” license, plus one “SA-XT Read Only” license.
▪An Updater uses one “SA-XT” license, plus one “SA-XT read/write” license.
▪A System Architect XT Web Service session uses one “SA-XT” license plus one “SA-XT-WebService” license.