a user allows you to see what the user can access and view within the Services
Manager control panel. You can do this, for example, when troubleshooting a
system problem that a user is experiencing. To impersonate a user, you must
have the User Administrator security role assigned to you.
While you are
impersonating a user, you cannot impersonate another user, even if the user you
are impersonating has the User Administrator security role assigned.