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+# Software architecture
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+
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+## Program flow
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+
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+`router.php`
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+: Receives every external HTTP request from the web server, executes actions required in any case, executes matching code in `pg-act` if appropriate, and calls `view.php` either way.
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+
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+`pg-act/`
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+: Executed when a form is submitted: checks that every parameter is valid and secure, then executes the feature of the page according to the parameters.
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+
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+`view.php`
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+: Displays global HTML and includes matching file from `pg-view`.
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+
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+`pg-view/`
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+: Displays the main page content (notably HTML forms), may sometimes display form output passed through the `$data` array.
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+
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+The `output` function is used to return success or error messages and stop processing of the request.
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+
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+## Other components
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+
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+`fn/`
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+: Functions, grouped by concerned service
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+
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+`sftpgo-auth.php`
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+: When someone tries to log in over SFTP, SFTPGo sends username and password to this script, which queries the database and replies whether authentication succeeded or not.
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+
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+`check.php`
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+: This file is not part of the normal program execution, it is meant to be run by developers to test that the current setup is working.
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+
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+`DOCS/`
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+: Documentation (some important or standard files may be directly in the root)
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+
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+`css/`
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+: Each `.css` file in this directory is declared in every page.
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+
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+`db/`
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+: SQlite database, the only directory writable by the program
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+
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+`locales/`
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+: Gettext translations, see [translation.md](translation.md)
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Miraty