what is avast! SecureLine TAP Adapter v3??

I see this avast! SecureLine TAP Adapter v3 in my network adapters in MS Windows 8.1 pro. control panel.

from what i can gather from searches it is supposed to provide a secure channel over ethernet LAN.

if so, where is the available documentation on this product?

is there an API I can use to take advantage of it?

does it cost anything more than my premium membership or is it part of that membership?

it asks me to enable the device, so it is disabled by default, correct??

please clarify

thank you.

https://forum.avast.com/index.php?board=53.0