What's the "Ethernet MAC address pass-through" introduced in 8.1?

[qp6019352]

Hi,

the release notes for the DisplayLink Software Release 8.1 M0 say:

Originally Posted by http://assets.displaylink.com/live/downloads/release-notes/f728_DisplayLink+USB+Graphics+Software+for+Windows +8.1+M0-Release+Notes.txt

[...]

DisplayLink software release 8.1 delivers the following features:

- DDC/CI command pass-through support for DL-6xxx devices
- VLAN, Wake-on-LAN, and headphone privacy for DL-6xxx devices
- Ethernet MAC address pass-through
- SHA-256 driver signature hashing
- DL-41xx DDC/CI support to control brightness and contrast
- Mouse cursor smoothness improvement on Windows 10

[...]

What is this "Ethernet MAC address pass-through"? What does it do? What is it good for? Why has it been introduced? And why isn't it described in the release notes in the first place? Why having to register and ask on the forums? Or is there some documentation for it somewhere else?