+### Actuator
+Actuator is anything that takes action upon controller messages. A few generic
+ones are included:
+
+- `khatus_actuate_alert_to_notify_send`
+- `khatus_actuate_status_bar_to_xsetroot_name`
+
+and, by default, are left disconnected from the controller's output, so if
+desired - it needs to be manually attached when starting `khatus`. For example,
+in my `.xinitrc` I have:
+
+```sh
+$BIN/khatus \
+2> >($BIN/twrap >> $HOME/var/log/khatus.log) \
+| tee \
+ >($BIN/khatus_actuate_status_bar_to_xsetroot_name) \
+ >(grep -v MpdNowPlaying | $BIN/khatus_actuate_alert_to_notify_send) \
+2> >($BIN/twrap >> $HOME/var/log/khatus-actuators.log) \
+&
+```
+(where `twrap` is a simple script which prefixes a timestamp to each line)
+
+The idea is to give maximum flexibility for what to do with the controller
+output, say, for instance:
+
+```sh
+$BIN/khatus \
+| tee \
+... \
+>(grep '^REPORT' | actuate_report_to_email) \
+>(grep '^ALERT' | grep mpd | actuate_alert_to_email) \
+>(grep '^ALERT' | grep IntrusionAttempt | actuate_intruder_to_iptables_drop) \
+>(grep '^ALERT' | grep NewDevice | actuate_alert_to_notify_send)
+>(grep '^ALERT' | grep DiskError | actuate_call_mom)
+...
+```
+... and so on, for any other such fun you might imagine.
+
+### Errors