Architectural Upgrade 2026-03-30: Modular Emacs, org-gtd v4.0, and PSF Phase 1

notes/closos-multiple-environments.org

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+#+TITLE: CLOSOS: Multiple Simultaneous Environments
+#+ID: closos-multiple-environments
+#+DATE: 2026-03-22
+#+FILETAGS: :architecture:lisp:os:closos:security:
+
+* Concept
+CLOSOS supports multiple simultaneous global environments, where an environment is a mapping from names to objects (functions, classes, packages).
+
+* Key Principles
+- **Isolation by Scope:** Each user or process can operate in a private environment. Redefining a system function (like `print-object`) in one environment does not affect other users.
+- **Dynamic Adaptability:** Facilitates safe experimentation with new features without risking system-wide corruption.
+- **Late Binding:** References are resolved against the current environment at compile/load time, enabling live updates and hot-reloading.
+
+* Source
+:PROPERTIES:
+:ID:       9c69a9ab-1c96-490e-9a8e-fbeafacba30e
+:END:
+- [[attachment:strandh-lispos.pdf][Robert Strandh, "CLOSOS: Specification of a Lisp operating system" (2013)]]