When you want to list the users currently logged onto your SAP Production System, don't use AL08 (Although this...
By submitting your personal information, you agree that TechTarget and its partners may contact you regarding relevant content, products and special offers.
will give you a quick aproximation of how many are logged on).
Instead, use SE16, table USR41.
This table will list all users in order of their ID, thus allowing you to see who is logged onto the system more than once and on which PC.