Two iPads talking to each other

I'm hoping this is a no brainer. I've been doing iPhone development and have been asked to develop an iPad app for internal company use whereby 2 or 3 iPad开发者_开发问答s in close proximity can talk to each other.

The following description isn't really necessary but I just want to solidify what I mean by "talk to"

Conceptually: three people, each with an iPad, each iPad having the complete listing of e.g., both all UPS packages that arrived/will arrive in the morning delivery totaling 500+ per delivery and an internal hot list of packages that when they arrive must be immediately delivered. Each of the three people continually grab packages, and select their package from the UPS list. Other stuff is entered like who gets the package, which internal bin the package was placed, whether on the hot list, etc. but the key is that all information has to be current in real time (+/- a few seconds) on all iPads participating in the package grab.

With the features that the iPad has, what's the best way to make this possible?

Thanks

Using the gamekit apis will be ideal

I'd write an app that uses Zeroconf/Bonjour to discover other instances of the app running and send XMPP messages around.