anchor.diff:  
   The DEA also checks for a `AppState` object for the application.
   
  -
   ## <a id='usage'></a>Usage ##
   
  -You can run the dea executable at the command line by passing the path to the DEA configuration file:
  +You can run the `dea` executable at the command line by passing the path to the DEA configuration file:
   
   <pre class="terminal">
   $ bin/dea config/dea.yml
  
positive.code: #   after_start: path/to/script
  #   before_stop: path/to/script
  #   after_stop: path/to/script
  ## <a id='run-standalone'></a>Running the DEA Standalone ##
  
  ```
  
  When you contribute to the DEA, it is useful to run it as a standalone component. This section has instructions for doing so on Vagrant 1.1x.
  
  Refer to the [Vagrant documentation](http://docs.vagrantup.com/v2/installation/index.html) for instructions on installing Vagrant.
  
  Follow these steps to set up DEA to run locally on your computer:
  
  <pre class="terminal">
  $ git clone http://github.com/cloudfoundry/dea_ng
  
negative.code: title: Droplet Execution Agent
  ---
  
  A Droplet Execution Agent (DEA) performs the following key functions:
  
  * **Manage Warden containers**: The DEA stages applications and runs
      applications in [Warden](./warden.html) containers.
  
  * **Stage applications**: When a new application or a new version of an
      application is pushed to Cloud Foundry, the Cloud Controller selects a DEA
      from the pool of available DEAs to stage the application.
      The DEA uses the appropriate buildpack to stage the application.
      The result of this process is a droplet.
  
  * **Run droplets**: A DEA manages the lifecycle of each application instance
      running in it, starting and stopping droplets upon request of the [Cloud
      Controller](./cloud-controller.html).
      The DEA monitors the state of a started application instance, and
      periodically broadcasts application state messages over
      [NATS](./messaging-nats.html) for consumption byHM9000.
  
  ## <a id='directory-server'></a>Directory Server ##
  
  