This document discusses ClojureScript and WebSockets. It provides an overview of WebSockets capabilities like async communication, full duplex communication, and server affinity. It then discusses several ClojureScript libraries for working with WebSockets, including ptaoussanis/sente, aleph, weavejester/haslett, and nilenso/wscljs. It calls out metosin/eines specifically, noting it is not ready for production and only supports the Immutant server, but is used by the author. It concludes by providing a link to a GitHub demo of ClojureScript and WebSockets.