transmission/docs/Transmission-Architecture.md

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Transmission is fundamentally a Bit Torrent client and communicates with other Bit Torrent peers.
In addition to this Transmission supports network-based remote control, whereby an authorised user may control the Transmission core from 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 (OS X, 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 - OS X
* 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 Qt GUI + Transmission Core, the Qt component may be packaged on its own as a purely remote tool.