I think I understand, and I must say your english is great for you being German. So you are saying if I define var available; in ANY .wdl code, (such as abc.wdl) I can use the variable in abc.wdl in ANY .wdl code after that, including if you put (say abc.wdl) in your level code
example:
include <abc.wdl>
...your main level's code...
function wowthisiscool
{
available = 20; //THIS WOULD WORK?
}
then you can put the var avariable in ANYTHING after the include? Hope that made sense. If that's right, I don't understand why I got this in my head that you couldn't?