Similar to the File menu you would encounter in other word processors. Use it to Open, Save, Share and Print documents.
The list at the right displays your last used files (up to 10, most recent on top).
The Send function allows you to email the open document to any user. Those to whom you have already sent an email will be displayed for quick selection.
Note the hotkey assignments next to several of the commands at the left:
Alt-N will open a new window displaying a blank document.
Alt-S will save the currently displayed document.
Alt-H will close the current window (first asking if you want to save your work) and return you to the main menu.