Activating a radio controlled LED wristband

Hello!

On their recent Tour, Coldplay gave wristbands to the audience that had 
LEDs in them and a radio receiver.
They were switched on for certain songs 
(http://www.youtube.com/watch?v=w07jGlgESTs).
I was wondering if there was a way to reactivate them.
There's a ISM Receiver Si4313 
(http://www.silabs.com/products/wireless/EZRadio/Pages/Si4311-12-13.aspx) 
and a µC Si C8051 F980-GSM 
(http://www.silabs.com/products/mcu/lowpower/Pages/C8051F98x.aspx) on 
the board (http://ostermann-net.de/misc/xyloband1.jpg).
There are Rx, Tx, C2D and C2K Pins available.
There is no way to sniff the activating signal unless u are at the 
concert (or outside the venue).
Do you think there is any way to find out how to activate them? I guess 
the protocol shouldn't be too complex.
Maybe somehow read out the µC?

Thanks in advance for helping!