So back to my original answer.

At the time I bought the SDK, it cost $100 and the license explicitly forbade saying anything whatsoever about the performance of the hardware or software or about the adequacy of the support. I see they have removed many of the more restrictive terms from the current license but I am still bound by the terms in effect at my time of purchase.

There are a few developers who post to the Insteon forum at http://www.techmall.com/forum.asp?FORUM_ID=9

You might ask your question there although I believe most of them develop PC software using DLLs from Smartlabs.