Scratch-off interaction

Hi,

I recently came across a post in which both David and Gerry had shared a file for creating a ''scratch-off'' interaction.

http://community.articulate.com/forums/p/34978/236994.aspx

I downloaded the file that had been shared and played around with it. David had created several states which were named as Normal, starting, 1-pass, 2-pass, 3-pass and final. I was not able to see these state names in the in-built ones. How were they created?

Also, the variables that had been given for the Object triggers, can anyone please explain them. Maybe if you can share a screener explaining how you did this interaction, it would be really helpful.

I hope that someone can help me out in this