> For the complete documentation index, see [llms.txt](https://4wsplatform.gitbook.io/user-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://4wsplatform.gitbook.io/user-guide/modules/bpm/ee0-3-platform-integration.md).

# Platform integration

Activiti is composed of two distinct web applications: Activiti Rest and Activiti Explorer. The first application is the **BPMN engine**.

![](/files/-M2wR6xmn2OdTFcJ-5WK)

Platform is fully integrated with the engine: there is no need to work with this application in any way, since Platform provides a user interface to communicate with the engine and manage processes.\
The latter provides a **graphical web modeler** to define BPMN processes. Again, Platform embeds this system and allows users to work only with a single user interface, the one provided by Platform.

Platform Web Designer includes 4 functionalities in the Administration -> Activiti menu:

* Processes and models
* Process instances
* To do list
* Process history

Each of these menus are described in detail in the following sections.