your computer will freeze up and your steam account will melt.. the other players will see you with a gigantic CHEATER moniker over your head and possibly your electric bill will triple.
it's probably best not to try it..
the latest trainer (already posted) has been improved to work on all the modes in the game, including cataclysm.
as stated in the instructions, the best use of the option is AT THE START OF THE MISSION and press the option key ONE TIME.
You will need to do this at the beginning of each mission.
For those that need it, here are some youtubes of where the grimoires are for each map. Note that you only need to collect 1 of them and then use our option to obtain 7.