Artisoft LANtastic Z
Released in 1993 by Artisoft
For DOS

LANtastic Z is a special version of LANtastic that does not use a LAN
card.  Instead, the hardware consists of a supplied serial cable
(called a null modem cable) to connect the serial ports of two
computers, plus a special parallel cable in case you prefer to
connect the parallel ports of two computers.

This product is based on Lantastic 5.0.
