Very simple: a number of CAS is assigned to a Server (each server has a unique ID) and each time a user connects to your Web app, FIC will check if a CAS license is available or not. If a CAS license is available, access will be granted.
FIC provides more flexibility (see our FAQ):
1/ only "active" sessions are counted
2/ If all CAS license assigned to your server are already in use (and active) FIC will continue - exceptionaly and temporarily - to grant access to the web app for the new user. A warning will be sent to you by email - as administrator - to inform you that you are exceeding your CAS license. Our anonymous FIC License Server monitors CAS usage only, and when our reports shows that this situation repeats itself, we will simply invite you to increase the number of CAS license assigned to your server to correct this situation.
Another option, is to consider having a pool of CAS licenses shared between all your web apps and customers. In this case it make sense to have some extra CAS license for added flexibility
Christophe
FoxinCloud
Give your VFP application a second chance in the Cloud.