The Quick Access Toolbar is used as a shortcut for buttons in the ribbon bar. Right-clicking on a button and selecting Add to Quick Access Toolbar will add a new shortcut.
Tag Browser: Opens the Tag Browser.
Save: Saves the file in its current state and location.
Save As: Clicking this button launches the file browser. Here, the file can be saved in a new location and/or with a new name.
Print: This button launches the print window. Here the print job can be configured before printing the document.