Cheat Engine

[Banrukai]

So i'm looking for the best method to find the key events with Cheat Engine, such as if a Key is up, or a Key is down.

In another forum thread ( I won't link it since most forums don't like links to other forums ), a guy posted some static memory addresses for GW2 that if the value was 1, then the key would press down in game, if the value was 0, then it wouldn't press down.

The thing is, i'm not sure how to go about searching this, since holding down the key and trying to do a search would be pretty much impossible because you would spam whatever key your pressing, in the Value box to search in Cheat Engine. So what i'm asking is, how do you go about finding something like this? Find something related to it, then kind of blindly search through code with the Cheat Engine debugger and try and find the address?