Most PKM tools ask you to adapt your thinking to a folder structure, a graph, or a prompt. SEN asks a different question: what if the operating system itself understood your notes?

SEN (Semantic Extensions Native) is a personal knowledge environment built around a radical premise — that semantic relationships between ideas should live at the system level, not in a plugin, not in a language model, not in a proprietary database.

This session is a live demo: SEN running natively on Haiku OS, with a first look at SENryu — a prototype of a dedicated SEN distribution — as a glimpse of where the project is heading.

You'll see SENity, a Markdown editor deeply integrated with SEN, where the connections you create don't live inside the editor — they're stored in the filesystem itself, and can be navigated and queried independently of any application.

There's a famous joke that Emacs is an operating system that also happens to be a text editor. SEN takes the inverse as a design principle: instead of turning an editor for PKM into an OS, why not start with the OS and make it PKM-enabled?

SEN is open source, local-first, and built to stay that way. Advanced features — entity extraction, semantic type identification, deep linking, and access to open APIs — are handled by independent plugins that you opt into. Your data never leaves your machine unless you explicitly ask it to.

SEN uses AI where it genuinely earns its place: drawing new connections, inferring semantic types like Invoice, Paper or Recipe, and extracting entities and relations from unstructured documents or media. Your ontology stays yours — AI helps populate it, not replace it.

If you've ever felt uneasy running your second brain inside an Electron app — this is for you.