Wikipedia
NetFoss
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.
NetFoss was developed in 2001 by pcmicro, and was released as freeware. Several minor updates have been released since then. The current version can be downloaded from http://netfoss.com.