The KA9Q Network Operating System ("KA9Q NOS") is one of the
most flexible MS-DOS applications you could use, offering an
assortment of TCP/IP clients and servers. Since the code is
small, and entirely memory-resident, it can be run off a floppy.
(Some servers, like smtp and pop, really want a hard drive.)
Unfortunately, it calls upon MS-DOS for file I/O...
<URL:http://people.qualcomm.com/karn/tcpip.html>
<URL:ftp://oak.oakland.edu/pub/simtelnet/msdos/tcpip/>
Phil Karn licensed the KA9Q code to Telebit for use in their
NetBlazer product.
(Telebit no longer exists as such, having purchased by a German
firm a little over two years ago.)
-=EPS=-