At http://googlewavedev.blogspot.com/2010/02/my-extension-wish-wave-timer.html
Anna-Christina Douglas wrote:
> I would love a collaborative timer, clock, or stopwatch that I could put at 
> the top of a wave when the meeting starts.

being implemented as a gadget, the timer will be updated in every
instance of the gadget.
which is quite wrong thing.

One way is:
The gadget raise an election among gadget instances to select which
instance will update the timer.
The election should be reraised when the instance is closed - but how
to determine this event?

Another way:
The timer is updated by robot and the time propagated to the gadget.
This requires cron events for every, say, second. This looks
overwhelming.
And is it yet possible to update a wave by cron, rather then as
ersponce to event?

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