Concurrent License Mode
If enabled, when Revit closes, the machine license active on the machine is released. When Revit opens, if a license is available, a license is activated.
Internet connectivity is required for this action to work
If the user does not have escalated rights on their machine, this action will fail
If the user does not accept any UAC prompt this action will fail (minimal interaction is required)
There is no guarantee a license will be available when a user launches Revit. When this (or any other exceptional condition occurs) the license utility window will remain on screen explaining the error to the user