Duplicating primary screen of iMac but extending on USB-to-HDMI adapters

Cerulean

[H]F Junkie
Joined
Jul 27, 2006
Messages
9,476
We have a 27" iMac with three additional outputs (1x Mini-DP, 2x USB-to-HDMI) all extended. We use this with ProPresenter 7.

Is there any way to mirror the primary screen (the one built in to the iMac) to a third USB-to-HDMI device but continue extending on the three existing outputs?
 
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