Emulate button press with AS?

Not sure if this is possible I have tried somethings but nothing working as I planned. Just curious if and how this is done.

example…
I have several buttons (button A button B button C) each a movieclip with function states(onRollOver, onPress, etc).
Now in order to get everthing running you need to click button A which sets variables and calls functions that enable buttons A1 A2 A3 and executes other functions. What i would like to do is a simple script which runs the first time only and emulates button A onPress.

Just curious if and how this is done.

Take Care
-JW