Image Capture and Storage: Step 2 The next step in building the prototype information management systems was to create the structure in the CRISTAL worksheet that was to contain the historic resource data records. In the prototype systems, the first block of cells is reserved for the initial commands referenced by the screen map (matrix). Each cell in this block of 100 cells directs the program execution to the cell (or block of cells) in the worksheet that contains the macro commands related to the icon displayed on the mapped graphics screen. Example: In the NPS/MORA (Mt. Rainier) Prototype, the [B3] matrix location in the graphics screen contains an icon of Mt. Rainier. When the icon is selected (by placing the cursor over the icon and pressing the left mouse button), the program activates the command in cell [B3] in the worksheet environment. Cell [B3], in turn, contains a macro command that sends the execution of the program to cell [C25]. Cell [C25] contains a string of macro commands that load a sequence of images depicting a representative range Mt. Rainier's natural and cultural resources to the graphics screen. Each image is displayed for a period of time specified by the system author. The user can prolong the duration of display by pressing [Shift-NumLock] to pause, and then any key to continue execution of the sequence. After the execution of the macro string, the user is returned to the graphics screen where other icons can be selected, and other information paths explored. Index to the Appendices Image Capture and Storage 1. Image Capture and Storage 3.