I think you haven't received an answer because you seem to be
asking a question that should be aimed at a developer, not a help
developer. Probably we aren't familiar with what you mean by
uCommand=HH_DISPLAY_TOC and your use of dwData.
We know how to configure a default topic, but what I'm seeing
in your question needs someone that develops applications to
answer. Not only that, but they will need to know what application
language you are using. C, C+, C++, C#, Java, etc.