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# Dev server and dev client The development loop is a server process (`pn start`) and any number of clients: the browser preview and debug builds on simulators, emulators, and devices. See the [Development workflow](../guides/dev-workflow.md) guide for how they fit together; this page documents the modules. ## `pythonnative.devserver` ::: pythonnative.devserver options: show_root_heading: false show_root_toc_entry: false members_order: source filters: ["!^_"] ### Server ::: pythonnative.devserver.server options: show_root_heading: false show_root_toc_entry: false members_order: source filters: ["!^_"] ### File watcher and source snapshots ::: pythonnative.devserver.watcher options: show_root_heading: false show_root_toc_entry: false members_order: source filters: ["!^_"] ### WebSocket ::: pythonnative.devserver.ws options: show_root_heading: false show_root_toc_entry: false members_order: source filters: ["!^_"] ## `pythonnative.devclient` ::: pythonnative.devclient options: show_root_heading: false show_root_toc_entry: false members_order: source filters: ["!^_"] ## `pythonnative.preview` ::: pythonnative.preview options: show_root_heading: false show_root_toc_entry: false members_order: source filters: ["!^_"] ## `pythonnative.bridge.web` ::: pythonnative.bridge.web options: show_root_heading: false show_root_toc_entry: false members_order: source filters: ["!^_"] ## `pythonnative.project.fingerprint` ::: pythonnative.project.fingerprint options: show_root_heading: false show_root_toc_entry: false members_order: source filters: ["!^_"] ## Next steps - [Fast Refresh](../guides/hot-reload.md) and the [hot reload API](hot_reload.md) for the device-side reload. - [Browser preview](../guides/browser-preview.md).