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+# Initializing SDK environment and templates
+
+## Initializing the SDK environment
+
+*(This document assumes that you are logged inside the **bsp-devkit** Docker
+container, used to produce Rcar Gen3 BSP image and AGL SDK in the
+previous **"SDK quick setup"** document)*
+
+To be able to use the toolchain and utilities offered by AGL SDK, it is
+necessary to source the proper setup script. This script is in the SDK
+root folder and is named `/xdt/sdk/environment-setup-*` (full name
+depends on the target machine)
+
+For Rcar Gen3 boards, we source the required SDK environment variables like
+this:
+
+```bash
+source /xdt/sdk/environment-setup-aarch64-agl-linux
+```
+
+To verify that it succeeded, we should obtain a non-empty result for
+this command:
+
+```bash
+echo $CONFIG_SITE | grep sdk /xdt/sdk/site-config-aarch64-agl-linux
+```
+
+## Application categories
+
+We provide multiple development templates for the AGL SDK:
+
+- Service
+
+  A Service is a headless background process, allowing Bindings to expose
+  various APIs accessible through the transports handled by the application
+  framework, which are currently:
+  - [HTTP REST (HTTP GET, POST...)](https://en.wikipedia.org/wiki/Representational_state_transfer)
+  - [WebSocket](https://en.wikipedia.org/wiki/WebSocket)
+  - [D-Bus](https://www.freedesktop.org/wiki/Software/dbus/)
+
+- Native application
+
+  A Native application is a compiled application, generally written in C/C++,
+  accessing one or more services, either by its own means or using a helper
+  library with HTTP REST/WebSocket capabilities.
+
+  *(our template is written in C and uses the "libafbwsc" helper library
+  available in the app-framework-binder source tree on AGL Gerrit)*
+
+- HTML5 application
+
+  An HTML5 application is a web application, generally written with a framework
+  (AngularJS, Zurb Foundation...), accessing services with its built-in HTTP
+  REST/WebSocket capabilities.
+
+- Legacy application
+
+  A legacy application contains a native application not made for AGL
+  Application Framework but launched by it. For such application, only
+  security setup is made.
+
+## Getting helloworld templates
+
+Application Framework _helloworld_ example live in a dedicated Git
+Repository, currently hosted on GitHub at the following address:
+
+[https://github.com/iotbzh/helloworld-service](https://github.com/iotbzh/helloworld-service)
+
+To get the templates in our development container, let us simply clone
+the source repository:
+
+```bash
+$ cd ~
+$ git clone --recursive https://github.com/iotbzh/helloworld-service
+Cloning into 'helloworld-service'...
+[...snip...]
+Resolving deltas: 100% (125/125), done.
+Checking connectivity... done.
+```