[Newbies] Etoy tutorials on Squeakland and documentation in general

Folks,

I'd like to go through the Etoy tutorials on Squeakland to familiarize myself about them but mostly also to be able to show them to our children as I find that Squeak is a very nice approach to programming concepts.

Thing is, what do I do with a .pr file ? Such as NewPaint_05.014.pr. Do I simply file it in ? Do I view it in Firefox using a plugin ?

This brings a related matter: documentation. Not tutorials, but complete documentation. I have the Guzdial book on Squeak (the white one) and it shows a lot of things, but is there an official documentation that is not made of snippets of info but is a reference to Smalltalk using Squeak ?

Cheers, Al