The problem is that your list is so big (both long and we were working with a lot of columns and a few equations) that Excel on my computer couldn’t handle it. I have a ton of memory on my computer, but it wasn’t sufficient. For example, when I tried a simple task like sorting the list, it would take several minutes to process the operation. I would literally click ‘Sort’ and then go and work on another task for a while.
I am not signing up for an account so I don't know exactly how the API works, but if I were setting up an iPhone App to work with this, I would use the rails plugin. Rails gives you JSON communication for free (IE no extra work required) http://guides.rubyonrails.org/layouts_and_rendering.html see section 2.2.9. Then use on IOS app use something like: http://code.google.com/p/json-framework/ to interact with that.

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