Breakpoints are markers in your ActionScripts that can stop your Flash movie at a set line of code to help you pinpoint trouble spots (for example, if youre unsure which specific line of code is causing the problem, set breakpoints at different areas to see if the problem pops up before or after them) so that you can debug your movie. Therefore it makes sense that youll find the breakpoint setting under the Debug Options button on the Actions pane, right?