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answers:

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My questıon is that, what are actions and what are avm instructions. I've been reading these two documents:

http://www.adobe.com/devnet/swf/pdf/swf_file_format_spec_v10.pdf

http://www.adobe.com/devnet/actionscript/articles/avm2overview.pdf

but I couldn't get the concept of it. Could anyone with more understanding of it explain this please?

A: 

With AVM2 and ActionScript 3 Adobe essentially stopped using actions as the primary vehicle for programming in SWFs. What they did was to introduce the DoABC tag which contains within it AVM instructions.

Branden Hall