This function displays the list of users involved in this Form Instance. 

Let's create a sample workflow to clarify this. 

The “ScoreWorkflow” process definition is configured with the “AddInvolvedUsers-Roles” and “RouteForm" steps. 

The “Required” step properties for the “AddInvolvedUsers-Roles” step are configured as shown below. The item type is “Process Instance,” and the item ID is the system variable that contains the current process instance’s GUID. This configuration allows certain application role users involved in this process instance to “View Form Instances” after the “RouteForm” task is completed.  

The “Optional” step properties for the “AddInvolvedUsers-Roles” step are configured as shown below. This configuration includes the application role users. 

The “Required” step properties for the “RouteForm” step are configured as shown below. 

The “Optional” step properties for the “RouteForm” step are configured as shown below. In this configuration, the Form is routed to a regular user.  

Generate a new Process Instance and execute it. Click the “View Instance” link to open the Process Instance on a new page. 

The Process Instance is shown below. The “AddInvolvedUsers-Roles” step has completed, and the instance is “sleeping” at the “RouteForm” step. 

Select the Items > Tasks menu option to view the “task assigned to” the regular user. 

Select the Items > Users menu option to view the “involved users” in this Process Instance. As observed, application role group users are added as “external users” and can view the Form Instance via the URL.