From: carlos tirado [mailto:tirado.carlos / gmail.com] 
> WinXP Pro SP2, Photoshop CS (8.0). Works here! :}
> 
> Have you seen this?
> http://partners.adobe.com/public/developer/en/photoshop/sdk/Ph
> otoshopScriptingGuide.pdf

In case it helps, I used to do JS scripting of PS a lot, so I parsed out
the (then-current) documentation into:
  http://phrogz.net/ObjJob/objects.asp?langID=9
and also created the high-level overview diagram:
  http://phrogz.net/tmp/Photoshop%20JS%20DOM%20Overview.pdf
and the cheat sheet:
  http://phrogz.net/tmp/Photoshop%20JS%20DOM.pdf