Difference between JS / Plug-ins / IAC ?

Hi!
I write some article about programing in Acrobat.
Acrobat use 3 possibilities of programing:
1. JavaScript (with some limitations of accessing to Acrobat objects)
2. Plug-ins developing (use Acrobat core API), developing plugins (DLL/API) in ANSI C (C++)
3. Interapplication communication = IAC (use PDF Library API), developing standalone programns (exe) in VB/VC++
As I understand from SDK Help, IAC don't have same access to all objects of Acrobat like Acrobat core API. It's right or IAC has same possibilities like Acrobat core API?

But, on the other hand, Acrobat SDK Help 9.1 state that PDFL (PDF Library) almost cover Acrobat Core API functionality (Plug-ins and Applications > Developing Plug-ins and Applications > Introduction > About PDF Library and plug-in applications).
http://livedocs.adobe.com/acrobat_sdk/9.1/Acrobat9_1_HTMLHelp/Plugins_Introduction.31.8.ht ml

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hi,
as Internet Explorer uses a JVM to run applets, I
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