Userview Key serves as a placeholder for a common value to be used by its elements (i.e. Userview Menu).
The usage of the Userview Key is dependent on the implementation of the element such as Userview Menu.
Figure 1: Example of Userview Key Usage to Pre-filter a Listing Based on a Column
Userview Key is most commonly used when you need to restrict the content of your userview to a certain category/attribute in your application.
The userview key is placed right before the element custom ID.
Link structure: userview/[App ID]/[Userview ID]/[Userview key]/[Element Custom ID]