How to set item via URL only when that item is null

From application A, I am attempting to set an application-level item of Application B via the URL to Application B. I only want the application-level item of Application B to be set when it the item is null. If it is not null, I don't want the application-level item to be set to something else.
I can't think of a way to do this from within Application B after the URL takes the user to Application B and I can't think of a way to do it from within Application A before the URL is invoked. The URL in Application A is part of a List (Shared Component) so it is not clear to me how to use PL/SQL to dynamically tell the URL to include or not include the assignment of the application-level item in the URL call.
Am I missing something obvious?

You could pass the value into a different item in application B. A before-header page process in the target page could then perform the transfer of the sent item into another item if that other item is null.
Scott

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How to set item via URL only when that item is null

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