Every time some GDB component containing graphic features is selected in a pane of the navigation window, execution of the menu item Edit+Open or pushing the button 
leads to opening a new window called map browser window.
The following components contain graphic features:
maps, layers of a map, feature types of a map layer;
themes, layers of a theme, feature types of a theme layer;
layers of external databases, feature types of such a layer.
The theme browser window will also be opened on double click on the name of any of the listed components, but in the right pane of the navigation window.
There is also a possibility to select several components in the right pane of the navigation window (for example, several layers from layer set of the map “N-City”) and the browsed theme includes all the selected components. There is an exception when several components of the upper level are selected, that is several maps, themes or EDB layers. In this case a separate browser window will be opened for each component.
On opening a theme browser window the system always creates a temporary nameless theme (browsed theme). This theme describes current state of browser window: set of displayed components, displaying styles, scale and many other things. In the course of browsing the user can change the characteristics of display, hence the properties of the browsed theme are changed too.
The browsed theme can be saved by the user, either as a new GDB theme or, if a cataloged theme is browsed, as a modification of this theme. Saving a theme allows remembering the current state of the browser window in order to resume browsing later in the same state.
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