Flex debbuger stepping documentation

While working on the code execution viewer, we made contact with Mike Morearty, who was the main developer on fdb and the Flash Builder debugger for a number of years.


During our correspondanse, Mike shared a lot of detailed information regarding the internals of the Flex commandline debugger (fdb), which has no public documentation beyond the Javadoc comments in the fdb source.


Mike just shared the fdb internals of how stepping works in his blog. 


He covers the following topics:
- What is the command-line debugger for flex (fdb) and where can you find its source code.
- How fdb interacts with the  flash debug player.
- How fdb stepping (step into, step over, step out) works.


Many thanks to Mike for this !

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