Some of the improvements made are the removal of certain filename restrictions, the addition of a 'last modifier' metadata field for directories, and authentication files.
The Inferno file protocol was originally called Styx, but technically it has always been a variant of 9P.
[4] A kernel client driver implementing 9P with some extensions for Linux is part of the v9fs project.
9P and its derivatives have also found application in embedded environments, such as the Styx-on-a-Brick project for Lego Mindstorms Bricks.
Examples include: Outside of Plan 9, the 9P protocol is still used when a lightweight remote file system is required: