Display all users in your system
When you start the user overview, the system displays the users who are logged on to the same application server as you are. You can however, display all the users logged on to the SAP System.
You are already in the User List screen (Transaction SM04 ).
Choose
Goto 
Terminals 
to display a list of all users who are logged on in your SAP system. The list includes all application servers in your system.
In this display, you can look at users, but you cannot access user sessions. To use the detailed information displays or control a user session, switch to the server on which the session is active. You do this by positioning the cursor on the desired user, and then choose
Goto Remote Server .
You return to the server where you were previously logged on by choosing Back .