You may have come here looking for Tk's [bell] command, which sounds an audible alert. This page is rather about BEEP, the Blocks Extensible Exchange Protocol. [[RFC 3080 says "a generic application protocol kernel for connection-oriented, asynchronous interactions called the BEEP (Blocks Extensible Exchange Protocol) core. BEEP permits simultaneous and independent exchanges within the context of a single application user-identity, supporting both textual and binary messages."]] [[" * a standard application layer that supports dynamic, pluggable application "profiles" (protocols) * peer-to-peer, client-server, or server-to-server capabilities * multiple channels over a single authenticated session * support for arbitrary MIME payloads, including XML"]]