The "Documents in hand" widget is a part of the "Documents" module:
The instructions of how to use widgets are given in the "Home -> Widgets" section. Being installed on the "Home" tab, this widget allows you to monitor the actual information of the "Documents" module. It also allows you to navigate comfortably through that information. It means that you will see in a special part of the "Home" tab the list of documents that are in hand. You will also be able to enter those documents by pressing with your mouse on their names and view them and their details, including signing and viewing statuses. Also you will have the possibility to sign or view the documents that were assigned to you without entering the "Documents" module.