* sub <nickname> - same as 'follow'
* unsub <nickname> - same as 'leave'
* last <nickname> - same as 'get'
-* nudge <nickname> - remind a user to update.
+* on <nickname> - not yet implemented.
+* off <nickname> - not yet implemented.
+* nudge <nickname> - not yet implemented.
+* invite <phone number> - not yet implemented.
+* track <word> - not yet implemented.
+* untrack <word> - not yet implemented.
+* track off - not yet implemented.
+* untrack all - not yet implemented.
+* tracks - not yet implemented.
+* tracking - not yet implemented.