6 .. toctree::

     6 PyAMS applications are built on a small set of prerequisites and external components which *can* or, for some of them,

     7    :maxdepth: 2

     7 *must* be included. Some of them are:

     9    site

     9 * a mandatory shared ZODB;  :ref:`zodb` chapter

    10 

    11 * a Redis or Memcached server, to handle cache and sessions;

    12     :ref:`pyams_cache` chapter

    13 

    14 * a websockets server (GuniCorn), used to handle desktop notifications; you can find information about this component in the

    15   :ref:`pyams_notify` chapter;

    16 

    17 * an Elasticsearch index, used to handle quick and optimized searching.

    18 

    19 

    20 .. image:: _static/architecture.png

    21