Terminal Emulation- AIX Server- Best Practices

Greetings. We share one AIX server with about 100 users over 4 hub sites via Procomm Plus. Users dvelop bad habits and exit straight out of the terminal window vice correctly logging out of their application session on the server. Sometimes we have to go into the server and terminate their session manually before they can log in again. What are some best practices I can develop, and also please provide me some technical leverage as I the importance of properly closing out of their session before closing their terminal window. Thanks in advance!