Double-clicking a document in Windows

[Graham Samuel]

I've read Ken Ray's excellent article on 'Setting Document 
Associations in Windows', and I think I understand it as far as it 
goes. Trouble is, the depth of my ignorance is so profound, I don't 
know where to look for more information - I am totally ignorant of 
command-lines (well, at least since the early 70s), shells, 
registries, you name it... anyway, rant over, my current question is 
this:

if my user double-clicks on a document (a stack or maybe a text file) 
which is associated with my Revo-developed app, I can use Ken's 
technique to get the app to launch and hand my app script the path of 
the doc to open; however, what if the app is already open? Can I get 
an environment variable to tell me this, or must I keep a system of 
flags within my app to distinguish between the first time the user 
double-clicks (when I will have to go through a long initialisation 
sequence for the app) and all the subsequent times (when I will just 
have to act as if my user had chosen File/Open from a menu)? I recall 
I have had to do this 'manually' on Macs (using Apple Events with 
SuperCard). In more general terms, where can I find out more about 
environment variables and also about creating and attaching icons 
(icon families?) to the application and its associated documents? 
Maybe I have just missed some massive part of the Revo documentation, 
but I don't think so.

While I'm at it, what is the Windows equivalent of the Apple Event 
"aevtquit", where the OS tries to force the app to quit, and how do I 
handle it?

Deeply confused

Graham
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          Graham Samuel / The Living Fossil Co. / UK & France