Those modules do not hold any of the BlitzMax base command set which is probably why they're not documented.
Whether they're useful depends on what you want to do. You have access to the source so you *can* see what function they contain.
Finally, if you're looking into the code that deeply and want a helper application then get HotDocs.
P.S. A lot of people get frustrated with the documentation. BRL are unlikely to change it. If you think something is missing or incorrectly documented then report it as a bug.
If you want to know how something works then search/ask the forums.
I'm not suggesting it is right just what you need to do.
Whether they're useful depends on what you want to do. You have access to the source so you *can* see what function they contain.
Finally, if you're looking into the code that deeply and want a helper application then get HotDocs.
P.S. A lot of people get frustrated with the documentation. BRL are unlikely to change it. If you think something is missing or incorrectly documented then report it as a bug.
If you want to know how something works then search/ask the forums.
I'm not suggesting it is right just what you need to do.