Thunderbolt 3 - How many ports can run at any given time
I apologise if this question has already been asked. I'm sure it must have been but I was unable to find it.
I have the 2017 iMac (Retina 5K) which has two ports on the rear of the Mac which lay beneath the Thunderbolt 3 graphic. To me, that would imply that I can use both ports as Thunderbolt 3 ports. As there are two of these, am I able to use both at the the same time with two Thunderbolt devices (emphasis on running at the same time) or am I limited to just one Thunderbolt 3 device running at any given time? I've received conflicting advice and I'm frankly bamboozled by what I have heard.
Thank you