Controlling the Timeline Easily

Introduction

I was talking with a friend of mine that wrote another tutorial about backward movement (Agamemnon rules!) and the idea came to me. A different approach for the same function.
This tutorial introduces the use of the _currentframe property and the while action. We will use them to stop, to move forward and backward a timeline. Also we will increase and reduce its speed. We'll even double speed it. Like this:

The tutorial requires basic to intermediate knowledge of actionscript.
R u ready? Let's go!