title: How to represent login of multiple users in UML use case diagram?
body: <p>What is the best way to represent the use cases of a system which has multiple users who have to log in to a system, in order perform various tasks?</p>
  
  <p>For example, consider a university system where the admin can log in and add students to a database and the registrar can also log in and modify the data base?</p>
  
  <p>Please post a simple use case diagram if possible. </p>