the combination of these 4 simple things in plan9 result in some pretty cool abilities.
1. everything is a file, including system controls.
2. all files can recieve text strings.
3. sending file names to the system plumber with right click opens the file in the correct application.
4. the acme editor is also a file browser, and a file controled by text strings.

The result is that everything can be turned into a list in a simple text document, and interacted with.
A list of urls in the editor, is also a bookmark list, and a right click will open a url in the browser.
A list of books in the editor is also a reading list, right click opens the pdf in the reader.
A list of music files in the editor, can be controled with a simple while loop, looking for the string '<--', and playing that file next, while moving the string to the end of the next line.
Everything can be controled this way. Its so simple, its weird.