The Image Sets page allows you to select the set to view if there is more than one set of page images for the work you have chosen.
If you have clicked on the Document Images icon, clicking the UMI reel number will take you to the Document Image page with the first page of the document displayed.
If you have clicked on the Thumbnails icon, clicking the UMI reel number will take you to the Thumbnails of All Pages page with thumbnails of all pages in the set you have chosen displayed.
If you are also subscribed to Literature Online, and the author also has works in EEBO, you will able to view Literature Online Author pages directly from the Image Sets page.
You can also read the EEBO Introduction for the work (if available) by clicking the Read the EEBO Introduction to this work link.