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DLP Link: What's in the white flash signal that's determining which side to see (left/right)?

My question is more from a user's point of view:

Whenever I read about DLP Link, it says that there is a white flash signal that's switching the glasses' transparent aspect.

But no-one seems to explain what distinguishes the white flash signal for the left eye from the white flash signal for the right eye.

There must be two different white flash signals, giving the glasses a hint which side to get transparent (and vice versa), otherwise whenever the viewer faced away from the exposition and back again then, there'd be a 50:50 chance of the glasses flickering the other (wrong) way around if there would only be one same signal.

So, I'd be very delighted if someone here enlightened me:

What's the difference between DLP link's white flash signal for the left eye and white flash signal for the right eye?

Your information is appreciated.