======Synopsis:======
[[set]] clock [on|off|toggle]

======Description:======
When turned on, the system clock runs and updates every minute.  This is
reflected in the [[set STATUS_CLOCK|STATUS_CLOCK]] status bar expando, and $Z.
If you turn the clock off, [[set STATUS_CLOCK|STATUS_CLOCK]] shows nothing.

It is a **BAD** **IDEA** to turn the clock off if you use $Z.  If you 
don't want to see the clock in your status bar, take %T out of your 
[[set STATUS_FORMAT|STATUS_FORMAT]].