When you have opened a lot of windows whilst working with ChessBase, you can switch between opened ChessBase windows with the key combination (hotkey) Ctrl-F6. That is the same hotkey as in Microsoft Word.

 

The advantage of this solution compared to the task manager is that here you are switching only between the windows opened in the current application (here CB 14). With task manager all open windows are displayed; changed to the desired window there is more laborious.