A list with everyone you had contact with. It will contain previous crewmembers, known witnesses, and everyone else you would have information about. You can go on mission in order to gather more information about a person, then this information would be stored here, under someones contactcard.
You can issue orders by using the contact list. What orders you can perform often depends on what information exists about a person in your contactlist. Torching someones house would require you to know their address etc