aos25 is a barebones and simplified OS with a hard-coded kernel that lets you navigate through, read, write and edit files. It's extremely simple to use and can be operated using basic, modular and high-level commands. You can also execute OpenBasic programs with it (they can modify files and the system, so be careful!) aos25 doesn't have UI. It doesn't have apps. It's just a stripped down way of editing and reading files - that can be expanded to have UI, apps, whatever. Besides, at every OS' core is just a file system organizing everything else. You should understand the Gesh File System (GFS) before trying to understand aos25, because GFS is the core of the system. Alongside the Gesh File System, you should try to learn OpenBasic if you’re interested in creating programs to run in aos. OpenBasic is rather simple and similar to Python.
View info and documentation at the forum: https://scratch.mit.edu/discuss/topic/841970/?page=1#post-8744385 don’t scroll down cheat code hack: file dir set $/documents/readme/ file edit read In $/programs/ohdear/ there is a program that’ll kill aos.