Deciding License Token Queuing
Consider what will happen when your customer tries to acquire a license but they all are in use. If you want to take care of this case in a graceful way, without requiring your customer to exit the application and try again, you can configure an application to enable license queuing. If license queuing is enabled and a customer fails to acquire a license token due to unavailability, a request is placed into a queue to wait for the next available license.
To enable license queuing:
>You can include the license queuing API calls in your application source code. To do so, you will need to write your own code to handle whether license queuing will be automatic or optional, how long to hold the user in the queue before exiting, what message (if any) to display, and so on.
>License queuing is only available for applications that use network licenses.