My program needs to display counterphase flickering test, i.e., one display is 
white text on a black background, and the other is black text on a white 
background, and the two displays are switched back and forth. I have concluded 
that there are two options to do this:

1. Draw each display into two NSViews, then switch back and forth between 
between them (via replaceSubview:with:) with an NSTimer to time the switches.
2. Use Core Animation to fade in one display and fade in the other.

In each case, I don't know how to avoid blocking a button presses whose action 
would stop the animation.

Which is the better way to proceed?  How do I keep the user interface 
responsive?

Please point me in the right direction.

Thank you.

Scott
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