Specifies an offset number that Author-it will use when publishing Windows Help and HTML Help. The Topic IDs will be set to the Object Code of the topic plus the specified offset. The main use for this property is if you are trying to combine multiple help files from different libraries and you want to ensure that the Topic IDs will not conflict.
The HelpTopicOffest element corresponds to the Topic ID offset field on the Linking sub-tab of the Windows Help tab of the Book object.