Disable SAP USERS to logon multiple times

How can I prevent a user ID from logging in more than twice?
In other words, I need to restrict each user so they cannot be logged in more than two times simultaneously. (Note: this applies to logins, not sessions.)

Set the parameter in RZ10.

login/multi_login_users             = set to 1 to activate 

login/disable_multi_gui_login    = you can put a list of users that should be allow to logon multiple times

List the user IDs separated by commas ",".

Do not leave space characters between user IDs.

Restart the SAP instance to see the changes.

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