+
+<p>Plugins and features of the binder need to keep track of the client
+instances. In principle, a binder afb-daemon is launched by application
+instance. But for services, a binder</p>
+
+<a name="Exchanging.tokens"></a>
+<h3>Exchanging tokens</h3>
+
+<p>At start, the framework communicate a common secret to both the binder
+and its client: the application. This initial secret is the
+initial token.</p>
+
+<p>For each of its client application, the binder manages a current active
+token. The initial token is the default active token. It is the expected
+token for new clients.</p>