WebSockets are the Internet-based technology used by Pager. It's high-reliability, has fallbacks to Flash and HTTP streaming, and is very performant on most modern browsers. It's so fast, we use it to send the relay messages back to the sender after the message is displayed.
We've found Pager works with most networks, browsers, and computers without extra configuration from IT staff. This minimal extra setup makes Pager a much easier solution to get up-and-running with over other local network-based systems.