This function re-sends the email notification for a process instance task in sleeping status. 

On the Process Instance page, select the process from the table and click on the View—Render menu option. The process instance is rendered on a new page. Select the Items—Tasks menu option. 

The tasks are listed in the table below, giving you full control. Select a task from the list and click on the Resend Email Notification button to repeat the notification email.