The Image Memory tab shows the total amount of memory, as well as the current page, shared, and group memory usage. Images are loaded 3 pages at a time (a page set), and the Image Memory tab reads the the page prior to and immediately following the highlighted page. In the graphic below, P51 - Explore Graphic page is selected. On this page's Image Memory tab, memory is read for the page set P50 - Expos, P51 - Explore Graphic, and P52 - Explore List.
Current Page Tab
The Current Page tab displays all graphics on the highlighted page.
Shared Tab
The Shared tab displays any graphics that appear on more than one of the pages within the page set. Graphics are only counted once toward memory size when shared within a page set.
Group
The Group tab displays all graphics within the page set.