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org.freedesktop is a namespace used on the D-Bus inter-process communication system to host a family of service names and interfaces defined by freedesktop.org, a cross-desktop collaboration that coordinates interoperability standards for Linux and other Unix-like systems. The namespace follows a reverse-domain naming convention, with org.freedesktop indicating interfaces and services produced by the freedesktop.org project. D-Bus applications interact with these services by calling methods, listening for signals, and querying or setting properties via the interfaces defined under this namespace.

Many common desktop components provide org.freedesktop interfaces. The most central is org.freedesktop.DBus, which exposes the D-Bus daemon’s own API and basic bus operations. Other widely used interfaces include org.freedesktop.Notifications, which defines the desktop notifications protocol; org.freedesktop.ScreenSaver, used for screen saver status; and power or session interfaces such as org.freedesktop.UPower or org.freedesktop.login1, which standardize power management and session tracking across environments. The exact names and available methods vary by version, so software relies on the XML introspection data published by the projects.

Freedesktop.org maintains the standards, documentation, and reference implementations for these interfaces, and coordinates contributions from major desktop environments, distributions, and application developers. The aim is to reduce fragmentation and promote interoperability by providing stable, well-defined IPC contracts across components.

The org.freedesktop namespace thus represents a foundational layer of cross-desktop IPC on many Linux systems, enabling applications to interact with system services and desktop components in a consistent way.