The maps you work with in MapGuide Viewer were assembled and edited by the map author, who specifies the data that will be in the map. The map author can create display themes that vary the display of map features according to certain values. For example, one theme might display counties in a range of colors to indicate population, allowing you to quickly spot the counties with the lowest or highest populations. The map author specifies the data you can access, how far you can zoom in and get detail, the reports associated with the map, the commands available in the viewer window, and more.
MapGuide Viewer displays only the commands, right-click menus, data, and reports that the map author included when creating the map.