To simplify the logon process to databases with command line tools, you can save the logon data (user name and password, database name) in a user key using the XUSER program. The data can only be accessed by the operating system user who owns the data.
When you want to connect to the database, you only need to specify your user key.
SAP systems use XUSER for the authorization of work processes. Exception: SAP liveCache systems that use central authorization.