Well, thank's a lot, both of you.
In the question of syntax, Sthrattoff was right. "$game_party.actors.size" worked. Which, actually, makes a sense.
The "game_party" class has an "actors" array as a public property, what you can call with "$game_party.actors". And this array has a "size" method, as every array in every C++ based language (and the Ruby is one of them, if I'm not mistaken...)
The "game_party" class is not a simple array, so you can't call on a size method, because there isn't one defined. Well, if it was, it would be like:
"def size
return @actors.size
end"
This is the same, as using Sthratoff's method, just written in the main game script itself, instead of calling through that array (anyway, i checked it... if you insert the above into the "Game_Party" part in the Script Editor, "$game_party.size" will work fine.)
On the other hand, Me cleared my thoughts about the "Interpreter" class. Double thanks. (Geeez, interpreter as a class... how far can "object oriented programmers" go..? Perverts. :-D )
Oh, by the way, I don't write so much, because I want to be a smartass... If I'm wrong, please tell me. That's my intent...
Isn't there some reference to the classes and methodes used by the program (like the Java reference at Sun's website...)? There is something in the help, but it's pretty much useless...