Click on the Stop button while a mapping project computation is in progress to halt the computation. The effect may not be instantaneous, however. Any delay will be a function of the complexity of the mapping being performed and of the stage of the computation at the time it was interrupted. An informational message appears in the progress box at the bottom of the application’s main window, containing the text “Warning: stopRun called for this project. Stopping….” When the mapping computation has been halted, the Stop button is disabled and the Start button re-enabled.