This article is from the MachTen & CodeBuilder FAQ, by Jaime Julca firstname.lastname@example.org with numerous contributions by others.
Power MachTen will run on machines with OpenTransport, such as the Power
Macintosh 9500. Tenon's TCP stack is interfaced to the PPC native
OpenTransport ethernet driver. OpenTransport and Tenon's TCP stack can run
simultaneously, as long as they are on different physical interfaces. Since
both Tenon's TCP stack and OpenTransport support MacTCP applications, you
can configure your MacTCP apps to use either stack. As soon as the
performance and feature set of OpenTransport are roughly equivalent to
Tenon's TCP stack, Tenon will fully adopt OpenTransport.