NSProgress optionally supports cancellation and/or pausing. Each activity has a 
set of associated properties. The problem is that pausing has the same set of 
property kinds as canceling, although canceling is one-way but pausing is 
supposed to be two-way. Like “canceled,” the “paused” property is read-only. So 
how are we supposed to un-pause?

I’m not talking about the developer’s own action code, but how to tweak the 
NSProgress object to let it know the action is back on.

— 
Daryle Walker
Mac, Internet, and Video Game Junkie
darylew AT mac DOT com 

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