"Now open "Play With Me 3". It opens into what looks like a thumbnail sketch of a Squeak desktop. It is, in fact, a thumbnail sketch of a Squeak desktop, a fact you can confirm by clicking on it, and choosing "enter project." Play With Me 3 is an example of a Squeak project.  Projects allow you to maintain a separate desktop for each one. Being able to specify different screen preferences for different projects is nice (I usually give different projects different background colors, so I can tell what I’m working on at a glance). The real benefit to projects, however, is that the changes made to the image in each project are stored separately, allowing code in a project to be transferred more easily. We’ll see more about this in a few pages when we discuss change sets.

    "You get out of a project by clicking on the desktop to get the system menu, and selecting either "previous project", which takes you back to the project you just left, or "jump to project", which gives you a list of all projects in the system and lets you choose which one to go to."