  This preprint presents a web app (essentially a web page-based program) with
which two or more users (peers) can view and handle 3D molecular structures in
a concurrent, interactive way through their web browsers. This means they can
share orientation and zoom level, commands and other operations in almost real
time over the Internet through standard web pages. This web app, open source
and built with the open source components JSmol for molecular visualization and
Peer.js for WebRTC connection, provides a practical tool for online
collaboration and teaching at a distance. More broadly, it illustrates the
strong integrability of technologies for client-side web programming, and paves
the way for similar apps for concurrent work in other disciplines. Web app is
available at:
http://lucianoabriata.altervista.org/jsinscience/concurrent-jsmol/concurrent-jsmol-visualization.html
