[Pharo-project] What will be the standard browser in Pharo?

Hi Folks, I am trying to port Squeak by Example to Pharo by Example. I am a bit confused about what is suppose dto be the standard browser now. I thought it was the OB Package Browser, but Damien Cassou just gave me a new image where the browser is an OB System Browser (Categories, not packages). I cannot even see any more how to switch between the two. Can someone enlighten me? (Then I can explain it in the book.) - on