Save:   Click it and it saves all the changes on the entire page.  Different types of Content can be edited on the same page, but you don't need to save each change individually.  While in Edit Mode, if you click to go to a different page, switch to Published Mode, or Logout, your screen will show a "Warning" dialog box which asks if any changes should be saved.  Click OK  to save or Cancel  to exit without saving anything.

Cancel:   Click it and it cancels all the changes on the entire page.  (This only works if your editing changes were not saved.)  This is a wonderful tool to use if you have made a mistake while editing, like wiping out a whole section of text.  You can click this icon, and it will bring your working page back to the original, minus the mistake.

Toggle Borders:  Click it while in Edit Mode to see the panel outlines as defined by the page's template.  This is useful to see which areas exist in the template before adding new Content, Tables, or Images.

Show Panel Width:   This is handy when determining the width requirements for placing images, Slide Shows, Image Galleries, and/or Flash.  Click it while in Edit Mode to see each panel's pixel width in the upper left corner of the panels as seen below.  To exit, click on the Show Panel Width icon, again.