The User Action Node is typically used for Approval Flows. It is uses with the IPA inbasket to allow users to take action on items as part of an automated process.
Select the task associated with the user action (this must be configured in IPA Rich Client prior to creating your user action node).
Configure actions associated with this task (such as “Approve” or “Reject”)
Decide when the action should proceed
Configure the timeout settings
Configure the notification settings
Configure the displays for various platforms
Decide if/how reminders will be handled