Hmmm..... without doing some very specific, targeted things to you i-device, you can only run one app at a time. I have both an iPhone and an iPad.

Which brings up the question, is there one app for both or one app for each? I HATE iPhone apps on my iPad. All they do it blow it up and the visuals get a little blocky when apps made for iPhone are stretched over the bigger iPad screen. I mean it's only 99 cents so I'll risk it, but.....