One of the main benefits of using Link, is that document tracking is much easier than in a normal BizTalk scenario. You can easily search for any document (in any stage of the flow) and, in case of errors, you can assign relevant persons to deal with the problem. The Tracking search contains many available filters, which eases the process of finding one or a specific set of documents.
Hover your mouse cursor over the 'Tracking' menu item to see your saved tracking searches. These are explained on the Tracking Search Result page. Click the 'Tracking' menu item to open the Tracking Search page.