[Koha] Browsing the shelf is based on ?

[hansbkk at gmail.com]

When the user clicks on the "browse the shelf" feature, is that based
solely on the call numbers? Or is there an interaction with the
"source item's" branch/library, collection code, shelving location,
item type or anything else?

Does every item show on the "shelf", or just one per biblio?  If the
latter, how does Koha select which item shows?