Projects can be considered to be Squeak components.
You can save a project with its World Morph and submorphs to a file or a server by choosing an option of the World menu. A '.pr' file is generated. To pass the project on you only need this '.pr' file. (from an email by Andreas Raab)
An etoy player may be associated with the WorldPasteUpMorph of a project whose script is run when the project is opened.