The session file gives full access to the account. If it leaks, remove
the device in Linked devices on the phone.
+External events
+===============
+
+Use ``onechat notify --source CHECK --id EVENT --text TEXT`` to send
+external data to the root at its next turn. Success means accepted, not
+processed. See ``onechat notify --help`` for the local test limits.
+
User service
============