Using multiple wixels for different purposes

Hey guys, I have a question regarding wixels and arduino- if my friend and I both built robots that were controlled by wixels, could we both drive our respective bots at the same time, or would there be too much interference? I don't have any wixels yet, so I can't test for myself. Thanks.

I can't connect to at the moment to read up on the wixel data. I guess it depends on whether they both transmit on exactly the same frequency, or if they have channels you can select for each pair.