A. On the server, run LMTools and click the Config Services tab. Select the Palisade service and click the View Log button. After the startup messages, you'll see a series of lines starting OUT or IN.
Each time a user opens the software, a line is written to the log with OUT and the user and machine IDs. When that user closes Excel, the license is released and an IN line is written in the log. Anybody with an OUT line and no IN line still has Excel open.
We have a Knowledge Base article with more details: