So my background has nothing to do with computer languages. I dabbled around with NWN2 scripting and that's about it. I've been crawling through story scripts and noticed:

_Player.isPlayer()

and another one:

_item.notAlreadyCaught()

So I was wondering if these (".isPlayer" and ".notAlreadyCaught") are reserved phrases/functions. Just from a lay person's view it appears this '.' is serving as a '=' but I don't really know when it's appropriate or possible to use one of these statements with a period in the middle...Also I was wondering how many more of these .phases exist out there.

Thanks guys/gals