Go To and Play

Hi i am quite new to Flash and i use Flash MX 2004.

I am experimenting with it at the moment and i need some help.

What is the actionscript if i want to go to a frame in a movie clip from another movieclip?

And also for future reference, how do you go to a frame from a movieclip/button to a frame in the main scene? Is it something to do with root?

Thanks, this is probably a very easy question to answer so thankyou.

Egg & Cress