Screensy is a simple screen sharing solution. Nothing more, nothing less.

It consists of two parts, the rendezvous part which runs on the server, and the
website part which runs in the user's browser. The rendezvous server is only
used for protocol negotiation and discovery of viewers. The video stream is
directly sent from the browser of the broadcaster to the browser of each
viewer. All traffic (between rendezvous and browser and between browsers) is
encrypted by default.