Question about the ignition module

hello,
I currently have a dynojet power commander 3 on my 2007 cbr 600rr. my mates tell me to get an ignition module as this helpes the power commander when it hits it's peak at high revs. Can any one tell me exactly what the ignition module is? how it works and how does it help with the power commander and what benefits can I get out of this device and the bike.