User Switching is a mature WordPress plugin providing instant switching between user accounts. The plugin allows administrators to switch to any user account from the Users screen, switch back to their original account, and 'switch off' (temporarily log out while retaining the ability to switch back). It integrates deeply with WordPress core authentication, using cookies to track originating users and session tokens to manage state. The code is entirely contained in a single main file (`user-switching.php`) that implements a singleton class with hooks and filters. It includes comprehensive integration tests (PHPUnit) and acceptance tests (Playwright) covering switching flows, capabilities, session handling, and command palette features. The plugin also provides explicit integration points for WooCommerce, BuddyPress, bbPress, and the WordPress REST API and command palette. The architecture is typical of a well-crafted WordPress plugin: event-driven via hooks, with clear separation between utility functions and the main class. It is not a library or framework but a self-contained plugin that can be dropped into any WordPress site meeting its requirements.