On 13 Jan 2011, at 7:06 PM, Greg Kennedy wrote:

> So my first problem is, how does iPhoto actually fire up an external editor 
> and pass the image or filename that it is interested in editing?

I'm sure it uses Launch Services. 
<http://developer.apple.com/library/mac/#documentation/Carbon/Conceptual/LaunchServicesConcepts/LSCIntro/LSCIntro.html>.
 Apple Events, your application delegate, and NSDocumentManager handle the rest.

I doubt this answers everything you meant to to ask. Perhaps you can refine 
your question for the list?

        — F

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