Ah, they are VERY useful. They keep track of numbers. For example:
NPC Code:
if (created)
{ this.hit=0;}
if (washit)
{ this.hit=this.hit+1;
hit();
}
function hit()
{ setcharprop #c,#v(this.hit);}
that makes this.hit go up ONE time everytime it was hit. And it will display it via #c as how many hits have happened. This.vars are ONLY for NUMBERS, no data can be stored in them. But I've done things like this:
NPC Code:
if (created)
{ this.dist=abs(npcs[1].save[1]-x)-abs(npcs[1].save[2].y);}
Something like that, i'm not exactly sure b/c I'm at school :P and i don't have much time.
BUT I had a central NPC set npcs[1].save[1 and 2] to it's x and y. So this.dist was the distance it was from the central point. It was useful because I was making a clock that rotated around the middle, so I didn't have to code everything to be so far from the central point, I could move it out to ANY distance I wanted and it would still make a circle around that middle point. the radius changed, but the middle point didn't
Try some stuff... I'll get you some examples if I get home in time.
---Shifter