The logon screen for an SAP system

User data is stored in the system by client, that is, you can, for instance, log on to client 100 in your system, but you will not have a user for client 333, even if your system has a client 900. The data for a particular user within a client is called the user master record. Multiple logons are logged as of SAP R/3 4.6. This is for reasons of both security and licensing. If the same user logs on more than once, then for each subsequent logon, the system displays a warning message that offers the user the following three options:  Continue with this logon and end any other logons in the system Continue with this logon without ending any other logons in the system (this is logged) Terminate this logon