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+# Ayatana System Indicator -- Session
+
+The -session Ayatana System Indicator is the the session menu indicator
+for Unity7 and MATE (optionally for others). Its behavior and features
+are listed at https://wiki.ayatana-indicators.org/AyatanaIndicatorSession
+
+For instructions on building and running built-in tests, see the INSTALL file.
+
+
+## Notes for Client Renderers
+
+Ayatana Indicator Session has two custom menuitems: the Guest and User
+switchers. As per the
+https://wiki.ayatana-indicators.org/AyatanaIndicatorSession
+specification, both need four visual components: (1) an Active Session
+Mark, the user's (2) icon, (3) name, and (4) a Logged In Mark.
+
+### User menuitems have "x-canonical-type" set to "indicator.user-menu-item"
+
+   Their four visual components are determined by:
+
+   1. You can test for the Action Session Mark by checking the action's state.
+      The state is a dicionary whose "active-user" key yields the current
+      session's owner's username. If it matches the username in this menuitem's
+      "target" attribute, show the Active Session Mark.
+
+   2. The icon is stored in the menuitem's "icon" attribute. If none is set,
+      the client should use a fallback icon such as "avatar-default."
+
+   3. The name is stored in the menuitem's "label" attribute.
+
+   4. You can test for the Logged In Mark by checking the action's state.
+      The state is a dictionary whose "logged-in-users" key will give
+      an array of usernames. If the array contains the username in this
+      menuitem's "target" attribute, show the Logged In Mark.
+
+### The Guest switcher has "x-canonical-type" set to "indicator.guest-menu-item" action
+
+   Its four visual components are determined by:
+
+   1. You can test for the Active Session Mark by checking the action's state.
+      The state is a dictionary whose "is-active" key yields a boolean.
+      If the boolean is true, show the Active Session Mark.
+
+   2. The guest user should use a fallback icon such as "avatar-default."
+
+   3. The name ("Guest") is stored in the menuitem's "label" attribute.
+
+   4. You can test for the Logged In Mark by checking the action's state.
+      The state is a dictionary whose "is-logged-in" key yields a boolean.
+      If the boolean is true, show the Logged In Mark.