Installing > Installing System Architect XT > Planning the installation of System Architect XT > System requirements for installing System Architect XT > License requirements for System Architect XT and System Architect XT Web Service
  
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.
Summary
Product
License(s) used
System Architect XT Read Only
SA-XT + SA-XT-Read
System Architect XT Read-Write
SA-XT + SA-XT-Read-Write
System Architect XT Web Service
SA-XT + SA-XT-WebService
See also
System requirements for installing System Architect XT