Two handlers sharing time

[Shari]

Is it possible to have handlers share time?  So that when it is idle, 
the second handler runs?

I have a very lengthy handler, that does certain things, calls other 
handlers, and they in turn call other handlers.  This sets up the 
data for the user.

As it takes more than a few seconds, I've created things for the user 
to "do" while waiting.

Is there a built in way for the main handler that sets up the data, 
to pause if the user wants to do something while it's running?  And 
then start back up where it left off the minute the user isn't doing 
anything?

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