As you can see, there was much trial and error. Here's the
final process that will work for RoboHelp HTML X3. Thanks to Rick
for the original explanation and to John McCallum for helping me
through this process.
Creating a Secondary Window in RoboHelp HTML X3
NOTE: We are using a defined a secondary window on the
Project tab called $global_InterfaceWindow. The $global_ prevents
the error message HH_GET_WIN_TYPE error.
1. Enter the name of the text to which you want to create a
secondary window. In this case, we will use ABC window.
2. Select ABC window and click the Insert Hyperlink button.
3. Enter JavaScript:RelatedTopics.Click() in the Link to
field and click OK.
4. Click next to the hypertext, and select Related
Topics… from the Insert menu. The Related Topic Wizard dialog
box opens.
5. Click Hidden (for scripts) option button, and click Next.
6. Select the topic to which you want to link, and click Add.
7. Click Next. Click Next again. Click Finish.
8. Click the Hidden rectangle , and click the TrueCode tab.
9. Locate the following phrase in green text.
<param name="Items" value="ABC Window\STYLE003.htm$$**$$"
>
Insert Name.chm::\ after ABC window;
<param name="Items" value="ABC
Window;Name.chm::\STYLE003.htm$$**$$" >
NOTE: The path to your topic is not always the same path used
in Windows Explorer. Be sure to set the path correctly, or the
topic will not display.
10. Complete the same process in the gray area; that is, the
CLASSID section of the code.
11. Locate the following phrase in green text.
<param name="Window" value="" >
Enter $global_InterfaceWindow between the double quotation
marks.
<param name="Window" value="$global_InterfaceWindow" >
12. Copy this phrase and paste it in the gray area; that is
the CLASSID section of the code.
NOTE: Once you paste this phrase in the CLASSID section, you
cannot click the WYSIWYG tab because it will remove the copied
phrase. Click a different topic to save it in the TrueCode tab. If
you need to access the TrueCode tab again for this topic, you MUST
copy and past this phrase back inside the CLASSID section.