Thank you all for your replies
Yepp, I figuered it wasn't "meant" to be like in Java. Yes it's very similar to C's #include, from now on I'll just think of it like that!
I'm a little confused regarding server- and clientside though. If I create a variable, let's call it his.test, on the serverside of an NPC; will that variable "exist" on the clientside aswell? Or should I look at serverside and clientside as to different "machines" so to say?
It feels like it's coming to me know! Although, I have a lot more to learn