This repository contains Peter Kay's DOS port of the ISO Development Environment. The port is notable in that it contains a TSR version of the WATTCP stack that exposes an (incomplete) version of the BSD sockets API. This allows programs to use WATTCP without having to compile it in as a library.

The API for the TSR is hooked on interrupt 17h; the Ralf Brown Interrupt List has details of it (or just look at the source code). The C client library for using the TSR is found here, but Berczi Gabor also created a Pascal library for it.