Unfortunately, Geoff, when it comes to interoperability, nothing is simple. If you follow Tim Gee's blog (
http://medicalconnectivity.com) you can see how complicated things can become, as soon as you try to standardize things. In the past, many standards (OpenInterface, MDIL, MIB) were proposed as standards for medical device connectivity. Some manufacturers invested heavily in complying to those standards - but in the end, no one else did. That left the industry fractured with many different "standards", with hardly anyone willing to invest in the next great thing. I hope IHE will succeed where other efforts have failed.