AL08 List of all users logged on

Transaction Code AL08 show the list of all users.Who are logged on the system globally.

• Active Instance --- Show the active instance.
• Active Users  --- Display the active user logged on the active instance.
• Interactive Users  --- Display the dialog users logged on the active instance.
• RFC Users --- Display the users connected via RFC on the active instance.
• Mand --- Client number.
• User --- user name of user logged on.
• Terminal --- From which Terminal/Machine user has logged on.
• T-code --- Last executed Transaction code.
• Time --- When user last initiated a dialog step by entering data.
• External session --- Number of External session the user has opened.It use SAP memory to share data between external session and it based on per main window .An external session is started when starting the program and when ever the use CALL Transaction.Each user can open maximum 6 SAP system window in a single SAPGUI Session.
• Internal Session --- Number of internal session the user has open,A session that with in external session. There can be many internal session in an external session. ABAP memory is used  to exchange the data between internal session.