Parallel Computing Toolbox & Web App Server

From https://fr.mathworks.com/support/requirements/matlab-web-app-server.html, I know that Parallel Computing Toolbox works on a MATLAB Web App server, but I could not find an explicit explanation of how the parallelization works with a server.

I presume that the cluster is the entire Web App server, and a parallel pool of 4 workers means that we allocate again 1GB RAM per worker as any logged user (but it is only an assumption). As I understand, if we have 40GB of RAM available and 10 users run an app that do some parallel computations with 4 workers each, there are no RAM left for a 11th user to run an app on the server.

Can anyone confirm this? Or correct me if I misunderstood something?

Thank you!