New document: allows you to add a new document.

Insert Pages: inserts additional pages into a scanned document. Highlight the first image in a page and the icon becomes active.  Put the additional pages in the scanner and click this icon.

Rescan pages: repeats scanning of selected parts of the document. Highlight the page or pages you want rescanned, put the originals in the scanner, and click this icon.

Split Document: splits the selected document into two documents. For more information on splitting documents, click here.