Hey Bob,
Programatically, I don't think there's a way to determine whether the command was received and acted upon.
At least from an MS-DOS perspective. I'm sure there's a way since we know that AHP has a real-time logging
facility. Now you're into the SDK which I have no experience with. So far, most, if not all, ahcmd calls to my
CM15a happen sub-second. I know this because I watch my XTBM to 'see' the outbound command
on the powerline. I have noticed that the more 'junk' I have on my USB bus, the longer it seems to take before
the CM15a gets the command for processing. When I say '...the longer it seems...', I mean I can barely
perceive a longer lag. Sorry but that's about all I can contribute. I'm sure the guys will jump in shortly.