Verbose Mode is an extra mode for debugging, in normal mode no messages where displayes when you press f2, the application switsch to verbose mode and displays all logging/debug messages
for example i found this on youtube:
mac normal mode> http://www.youtube.com/watch?v=zjC45ML-rDw
mac verbose mode> http://www.youtube.com/watch?v=BjuoGSIPu2k