Is this vendor open to consumers? If so you might bring up to them that being available to only one type of browser is a poor policy, if nothing else because for many of us IE is extremely glitchy. I don't have an iPad or a mac but I've stopped using IE because it won't run well on my Vista machine. I know this isn't the help you're looking for but being involved in Tech I know well enough that some people don't think about optimizing websites for multiple browsers and they're paying dearly for it'

http://www.appolicious.com/topics/135-help-my-vendor-does-not-support-safari-only-internet-explorersmart card I have been facing the same problem that you are facing. I'm confused and shattered with the application. The IE is dead so no company would support it and its not a better option than any of the browsers.