I just downloaded the Flex SDK4 and I am trying to figure out how the Actionscript Virtual Machine 2 links the built in classes, despite the fact that I cannot find the actual definitions on the computer.
I found some libraries like
While I am looking for actual classes, that I am familiar with Sprite.as, MovieClip.as etc.
--- Built in classes --
1) Where on the computer are the definitions found for the built-in classes (do the references even exist?)
2) How and When does the Actionscript Virtual Machine link the classes, if it does not have a direct reference to that built-in class on the computer(like Sprite or MovieClip)
You won't find the source .as files which is what it sounds like you are searching for. The SDK distribution has everything compiled and packaged up into libraries. The source is available in the SDK's SVN repository.