NetFoss is a popular Network FOSSIL driver for Windows. A FOSSIL is a serial communications layer to allow DOS based software to talk to modems without dealing with hardware I/O and interrupts.
A Network FOSSIL redirects such software to a TCP/IP address rather than to a serial modem. NetFoss is faster than other FOSSIL drivers, due to being written in 32-bit assembly language. It allows Zmodem transfers at up to 280,000 CPS.