This article is from the MachTen & CodeBuilder FAQ, by Jaime Julca firstname.lastname@example.org with numerous contributions by others.
MachTen is a complete UNIX operating system, and, as such, includes both
client and server components for each Internet service. Therefore, you could
use MachTen on every Macintosh. Alternatively, for the client machines, you
could simply use MacTCP with your favorite Macintosh client software, such
as Eudora, Fetch or NCSA Telnet. MachTen can provide Internet services for
any Mac or PC that supports TCP.