

The queue: every order line still waiting for goods, with customer, quantities and waiting time.
When you sell products on backorder, WooCommerce lets the stock go below zero, but it does not keep a list of what you still owe to each customer. Backorder Desk does.
Every time WooCommerce reduces the stock of an order line below zero, Backorder Desk records the units that went on backorder. Your team gets one queue with every line still waiting for goods: the order, the customer, how many units are missing and for how long.
When the goods arrive and you ship part of them, you record a partial fulfilment with its delivery note. The queue updates, and the full history of every line stays available.
Backorder Desk never changes your stock, totals, order status or refunds. WooCommerce stays in charge of all of them; Backorder Desk only keeps track of what is still owed and how it was resolved.