Expression window scripting question


I am going through the tutorials and I have gotten to chapter 7: Bones & IK.
In paragraph 13 you are told to type the following script in the Script Controller expression window (box). However there is only a note which follows directing you to go to the User Reference for sample MaxScript. I have gone through the Help> user reference and the MaxScript reference trying to find something and have had no luck.
I have spent the afternoon trying to figure this out and not having any success, could someone tell me how to find this script?

Thank you