Where are the objects of a stack after 'start using'?

[Graham Samuel]

This is a bit of a newbie question, even though I've been using RunRev  
for a very long time. Embarrassing, but there you are.

I am trying to construct a library by writing stacks and inserting  
their scripts into the message path with 'start using'. So far, so  
good. Then I wanted to set a custom prop in a library stack, and  
RunRev silently rejected this, presumably because the stack although  
being used, wasn't in the 'stacks in use'. Confusing, isn't it?

What if I want the objects in a library stack to be available to my  
application? How do I create a library of objects? I obviously don't  
understand how the whole 'start using' thing works. Can I do 'start  
using' and afterwards actually go to or open my library stack so that  
its objects and properties become public property so to speak? Any  
info gratefully received.

TIA

Graham