For example:
"An educational app to teach programming in python. The app consists of a code editor and source-level debugger, an online tutorial book, and example code for the user to edit and modify. Source code is stored in a read-only sandbox; any user-edited material must be saved to DropBox or an iDisk. Some built-in language functionality is disabled, to comply with App store policy (notably fork()/exec(), filesystem access outside the sandbox, most POSIX IPC, etc). Interpreter will only execute while app is open (no backgrounding)."
In other words, something like "Learning Python" as an ebook, with http://www.skulpt.org/ (Skulpt) wired up to it, possibly with some IDE-style bells and whistles.