RetroTech Chris on Twitter: "So, this is fun! I connected a DOS PC to a Windows XP system using a null modem cable. I can browse the web and share files! https://t.co/2phGZqd6SZ" /
Network Serial Port Kit - Share and access any serial devices or create virtual null-modem cables over a TCP/IP network or the Internet.
Virtual Null Modem
Virtual Serial Port Kit - Create virtual serial ports connected via a virtual null-modem cable.