Monitoring User Logons in Application Server ABAP
Use
User monitoring is a central administration task in AS ABAP. The tool used for this task is the logon list. You can display user sessions for further analysis and log individual users off, if required.
Integration
You can access the logon list in various ways:
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Ttransaction SM04
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SAP menu:
Administration 
System Administration Monitor System Monitoring User Overview 
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From the system overview (transaction SM51)