radiated emissions testing intentional radiator test setup?

[Jester]

In the past when testing unintentional radiators for example something with an Ethernet port in an anechoic chamber for radiated emissions we had to exercise  the Comm ports as they would be used normally. So we typically had a pc outside the chamber continuously talking to the DUT.

For intentional radiators for example WiFi or Bluetooth, to communicate with the DUT as they normally will, requires the companion transceiver to be in the chamber or at least have an antenna inside the chamber. If that’s the case how does the test equipment and or operator distinguish between the DUT and the companion device during the scan?