Bonjour Catherine,
It’s difficult to answer this question without further information, such as what type of document you refer to. Perhaps a CLI card? These „applicants“ are searching for the persons the card is about.
(click on the card for more explanations)
Here is an overview of the different kinds of documents stored in Arolsen
Here you could search for names and topics yourself:
Arolsen online archives
this ENC-Forum
the „old“ zooniverse ENC Forum
You can also send a request to the Arolsen Archives.
Maybe you also find this Pinwand thread helpful (various databases are linked there)
I’m forwarding your question to the Arolsen team.
Kind regards to France!