transmission/docs/Transmission-Architecture.md

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Transmission is fundamentally a BitTorrent client and communicates with other BitTorrent peers.
In addition to this Transmission supports network-based remote control, whereby an authorised user may control the Transmission core from the same or another machine via the [Transmission JSON RPC protocol](rpc-spec.md).
To make remote control easier from an arbitrary machine, Transmission core can also serve a JavaScript web application to any browser and which in turn makes JSON RPC calls back to the Transmission core.
The core components and methods of control are shown below:
![Architecture](https://transmission.github.io/wiki-images/Transmission_Architecture.gif)
From the above diagram it can be seen that a Transmission core may be controlled by the following:
* _Local_ directly linked GUI (macOS, GTK+)
* _Local_ or _remote_ Qt GUI
* _Local_ or _remote_ command line utility
* _Local_ or _remote_ Transmission web application running in a web browser
The multiple methods of controlling Transmission and the various native GUIs available result in several different Transmission products as shown in the figure below:
![Products](https://transmission.github.io/wiki-images/Transmission_Products.gif)
The products are:
* Transmission desktop - macOS
* Transmission desktop - Windows, Linux/Qt
* Transmission desktop - Linux/GTK+
* Transmission daemon (headless)
* Transmission command line
The Transmission packages available on various distributions may include one or more of these components.
Note. Although the diagram shows "Transmission Desktop Qt" as being a Qt GUI with Transmission core, the Qt component may be packaged on its own as a purely remote tool.