Keywords
If you plan to generate a CHM help file then keep in mind that you can add keywords to create an index list. Each keyword is assigned to certain pages of the generated help file.
Select a page in the project tree and choose the keywords that you want to link to that page by selecting the corresponding check boxes next to them. Use the toolbar buttons to add or delete keywords.
Click this button to add a new keyword at the same level. You can also use the 
Click this button to add a sub keyword to the selected one. Keyboard shortcut for this command is 
Click this button to delete the selected keyword. You can also use the 
Click this button to see all the topics assigned to the selected keyword.
Click this button to hide/show unrelated (unchecked) keywords.