Tab Pages
The second line of the 'County-Hunting Mapper' main program-window, below the Menu-Bar, features a row of page-tabs, marked 'Map Plotting', 'Vector Map', 'Online Map', 'Search', 'Tables', 'Contest Mode', 'External Logger', 'Log Summary', 'Log Plotting', 'Main Log', and 'Auxiliary Log'. Clicking any of these will show the associated page in the main program-area, where most of the 'action' takes place.
The tab for the page that you are currently viewing has a different background-color from the others.