Adding info at time of exposure

I have a huge project that consists of taking thousands of photos while moving from place to place in a fairly small area and adding a unique code to each photo. It would save me a lot of time if I could do this at the time of exposure rather than later on. Ideally I would have my Canon 5D II tethered to the laptop so I could do this in Capture One but it may not be convenient to carry the laptop when I shoot. Could this be done wirelessly with the laptop in the general area but connected via WiFi and using iPad or iPhone to key in the data?

Thanks for any help.

Rick

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