The Help targets use the default window, named main, to specify the size, location, appearance, and the user interface presented to the reader. You can change the default characteristics by editing the properties of this window in ComponentOne Doc-To-Help 2007.
You can also define secondary windows for displaying certain kinds of information. For example, if a topic lists a series of steps for carrying out a procedure, you may want to provide links to other topics with illustrations or additional instructions. By associating a secondary window with the character style that implements the link, you can display multiple topics simultaneously while giving the reader control over the level of detail and the layout of the Help windows.
By selecting the Windows item on the project editor tree list, you are presented with a list of the currently defined windows in the right pane. By choosing any one of the windows, the lower left pane displays the property settings for that window.
More:
Editing Help Window Properties
Using Themes to Modify the Help Window