For developing in Adobe Flash you can trace() your results in the output window of the authoring environment. Without the authoring environment you can trace through javascript or to a dynamic textfield. Still it would be much easier to keep those same traces that you have set in your Actionscript code.

This can be achieved by downloading and installing two things (or three if you don’t have the browser Firefox):

1. Download and install the Adobe Flash debug player at http://www.adobe.com/support/flashplayer/downloads.html. This will give you error warnings of all Flash related errors.

2. Download and install the Firefox add-on called Flashtracer at http://www.sephiroth.it/firefox/flashtracer/ and adjust the settings so the debugger errors/traces will appear in the sidebar of your browser.