In Windows XP/Server 2003 and prior versions, both services and applications used the same session (Session 0). As a result, Windows services could run interactive applications in the same session as user applications. Users could also run applications in other sessions using Terminal Services (Remote Desktop).
Windows applications (GUI and console) run in an environment called Windows Station/Desktop. Window Station/Desktop provides the resources and environment (such as fixed heaps) necessary for the applications to run. The resources provided by each Window Station/Desktop is limited. Some applications (such as Microsoft Excel) require more resources than non-interactive Window Station/Desktop can provide. In that case, the job needs to be run interactively.
When running interactive jobs, the user logs in to the interactive Windows Station/Desktop or connects to it using the Remote Desktop. The interactive Windows Station/Desktop receives user mouse/keyboard input and is visible to the user.
To run interactive jobs, you can use Terminal Services or Session 0.
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