Saving-preferences.md

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+Preferences from the setting window are saved in the file
+`ENV:timekeeper.prefs`
+
+Preferences are also persisted between reboots in the file
+`ENVARC:timekeeper.prefs`
+
+Depending on the setup the content of timekeeper.prefs could be:
+
+```
+CX_POPUP=NO
+CX_POPKEY=lshift control t  
+CX_PRIORITY=25  
+THRESHOLD=1000000  
+SERVER=de.pool.ntp.org  
+PORT=123  
+TIMEOUT=5000  
+INTERVAL=17500  
+READONLY=NO  
+EXPERT=NO
+```
+
+The preference file should not be edited under normal circumstances.
+
+**Caveats**
+
+Not only visible settings in the settings window are saved to the
+preference file. All setting are saved includes default settings and
+settings from CLI and icon tooltypes.