The girl in the videos frequently mentions saving the file
and then clicking 'run', and she appears to be doing the save in
one click, but she does it so fast I can't see what she is doing.
Can anybody shed some light on this?
I believe she's using a shortcut to save the file. In Flex,
the default shortcut for saving a file is Ctrl + S. Also, Flex will
automatically ask to save multiple files if you haven't, when you
run a project. Saving before you run a project avoids having to
click "OK" on a dialog prompt.
To run your project without clicking: press Ctrl + F11 or run
in debug mode, press F11.