Multi stacks = multi processes?

[Mike McManus]

I am sure this has come up before, but I can't find it.

I have a stack with substacks that will be handling a number of things 
from watching folders, copying files and processing very large files(up 
to about 300meg) None of the processes is a killer...under Mac OS X, OS 
9 is slow. But now I want to move this whole thing to a more hot folder 
based system. Meaning multiple users will be putting multiple files into 
folders that my app will then check, move, read and write.  I figure I 
can deal with handing of the process to substack or stacks as required, 
but I want them to happen simiultaniously?

What I want is to be copying at the same time a file is being read/wrote 
and still keep an eye on the directories. each process working with  
different files of course.  Normally Rev would not do that. But if I put 
the different processes in different STACKS or SUBSTACKS? would I be 
able to get this?