A participant is not an individual; it defines a set of users. When a process assigns a participant to a user task, the process sends work items associated with the user task to that set of users.
Procedure
Click
WelcomeUsers-Process in the upper-right pane.
This opens the
Process Editor pane.
From
Project Explorer, drag and drop the
Process Tester participant onto the
Display Message task.
Note: The validation marker now disappears because the user task has a participant.