Adding a second Ethernet interface

For NET+OS 6 with Fusion IP Stack there was a document “Adding a Second Ethernet Driver to NET+OS” showing like a cookbook what must be done.
For NET+OS 7 we have a different IP Stack from TRACK. How can we now add a second Ethernet interface, where can I find the information?
Thanks for any help.

Check the API Reference Guide, where you can see the call APAPP_2ND_INTERFACE_IP_ADDRESS for Treck stack.