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 containing the current process instance’s GUID. This configuration allows some application role users involved in this process instance to “View Form Instances” when the “RouteForm” task is completed.  

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

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 setup, the Form is routed to a regular user.  

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

The Process Instance is shown below. The process step “AddInvolvedUsers-Roles” 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.