for now, even while it's not explicitly noted somewhere, h-e-n GUI is supposed to end hostmode and disable VBUS boost mode, on closing it. I'm not a fan of this concept, but as long as we are following it, it's actually necessary to keep it open during hostmode, and also I don't see any better way to enable hostmode than via some kind of GUI. "safely remove" has already been suggested to Mohammad by me. Nevertheless AgogData's point is valid. Unless we change that concept of tearing down hostmode on closing GUI. cheers jOERG