+* 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.