How to check if a floating license(xPlm CadConnector) is in use or not?

We have 5 floating licenses of xPlmCad connector. Sometimes, the license is not released when the user logs out. We were given a new key to use and we want to try it out. 

How\Where do I check to see if the floating license is in use? It would be great if  we can see the users using the license. 

This information is not in the License Manager.