GBC applications use cookies to secure the communication with the Genero Application Server.

You can use cookies in your applications if you save or exchange data that you want to persist between different runs of an application. For example, Web applications that run on the same domain as your GAS and whose GWC cookie is set on the root path (/) of the URL are able to retrieve cookies in later requests for an application. When a request is made, the cookie is sent back from browsers to the GAS where it is recognized.

NOTE: Browsers generally need cookies turned on.

The GBC also uses local storage, which does not involve cookies, to store data specific to an application after the browser is closed.