Recording information in Outlook Journal

I recently found this and it mentions tracking time while working on a project in Microsoft Office Word. However, it doesn't mention exactly how to do this. I've done some searching but haven't been able to find anything. Does anyone use this, or know how it works? The full description is below.

<<In addition to tracking Microsoft Office Outlook items (item: An item is the basic element that holds information in Outlook (similar to a file in other programs). Items include e-mail messages, appointments, contacts, tasks, journal entries, notes, posted items, and documents.), such as e-mail, or other Microsoft Office documents, such as Microsoft Office Word or Microsoft Office Excel files, you can keep a record of any interaction that you want to remember.>>

Thanks!