I don't think its giving to much away to say that there are two main ways to get the imfomation required, both of which are worth looking up.
pre-show imfo gathering and live imfo gathering both of which may reguire special devices to achive the required result.
a third option is implanting the imfomation via variose methods, usualy during pre-show work.
other than that an e-mail to illusionist.com with the details should yeild a raft of products you can buy to achieve this, some taken directly from graigs suggested reading.
