# Reference

Source: https://docs.ideharmony.com/reference


Nothing in this section is meant to be read front to back. These are the pages
you arrive at with a specific question, usually while something is not working
or before you commit to depending on something.

## Before you rely on a feature

Two pages exist to be honest about maturity, and they are the ones to check
first. Both are more useful than a version number.

| Page | Use it to find out |
|---|---|
| [Feature status](/docs/reference/feature-status) | What ships, what is preview, what is designed but unproven, and what is only planned |
| [Known limitations](/docs/reference/known-limitations) | What does not work, what is not built, and what not to rely on yet |
| [Use Harmony in a browser](/docs/getting-started/web-app) | Website / web-app supervision versus desktop, and native apps in development |

> [!IMPORTANT]
> A feature appearing in these docs is not a promise that it is finished.
> Feature status is the page that distinguishes the two, and it is kept
> deliberately blunt.

## Configuration and environment

| Page | Use it to find out |
|---|---|
| [Configuration and data](/docs/reference/configuration) | Where Harmony keeps its files, and the config CLI |
| [Environment variables](/docs/reference/environment-variables) | What each variable changes, and which are validated rather than trusted |
| [Environment variable index](/docs/reference/environment-variables-index) | Every variable read by the application, extracted from source |

The index is generated from the application source rather than written by hand,
so it is complete but terse. The prose page explains which of them are
load-bearing.

## Platform, versions, and terms

| Page | Use it to find out |
|---|---|
| [Platform support](/docs/reference/platform-support) | The platform contract, native build requirements, and live download availability |
| [Changelog](/docs/reference/changelog) | Where release notes live, how channels work, and how to verify what you are running |
| [Glossary](/docs/reference/glossary) | Canonical definitions, with the distinctions kept sharp |

## Where to go next

- For the model these references describe, read [Concepts](/docs/concepts).
- For something failing right now, start at
  [Troubleshooting](/docs/troubleshooting).