In this paper we describe Net-console, a Web-based environment for the development of Message Passing Interface (MPI) programs. Using Net-console the user is able to write, execute, debug and evaluate the performance of such programs across the Internet, using a usual Java-enabled browser, without having to log on to a supercomputer in the traditional sense. The tools included in Net-console and their functionality, the languages used and the overall structure of the project are presented in this paper.