Suppose 100 people want to use XYZ Software in your organization.
But no more than 10 employees use XYZ Software simultaneously.
You don't want to pay for 100 licenses.
So you purchase 10 concurrent licenses of XYZ Software.
Then you install XYZ Software on all 100 machines together with low-footprint License Patrol client.
License Patrol will make sure only ten users can run XYZ Software simultaneously. We call it "enforcing concurrent license terms".
If the eleventh user tries to launch XYZ Software on her workstation, License Patrol will prevent her from doing that.
Alternatively, you can run License Patrol in "info-only" mode, when License Patrol informs the administrator about violations of concurrent license terms, so you know when to purchase additional licenses.