What is the '_' (underscore) in the userview link when we launch it and try to view?

 
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The userview has a form element which is mapped to a simple form with 2 text fields. When we launch the user view to just view the form, there is an '_' in the link. What is this for ?

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      Hi, I believe this is the Userview Key, the '_' should represent an empty value.

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