10. What tables make up the majority of the user master records? (Hint: If I wanted to find user master data, what table names can I search in se16 to validate user data on specific keys?)
c) User master records are keyed from several different tables, so unlike other SAP master records, user master is unique.
User data resides in table usr01-usr31 and ush*. This can be used as a quick and dirty way to obtain user data for any key -- such as user type, last logon, or any other information that I may want to filter data with relation to users. You can see different views with se11, se16, or se17, or you can make mass changes using se21.