boing.cgito generate the images. The program
boing.cgireturns a redirection request to an image whose pathname was encoded in its URL. The image serves as normal decoration in the page. But before it prints out the redirection,
boing.cgisends a datagram containing your host name, part of the PATH_INFO environment variable, and the whole QUERY_STRING environment variable to a server (the boingd) that I run while I'm logged in on my workstation.
/dev/audio, which means that I hear it, usually via a pair of two loudspeakers that I keep plugged in. (It also checks to make sure that the path doesn't leave the directory - don't even think of
/vmunix.) As a net result, my workstation makes ``boing'' whenever someone reads my hotlist, ``gong'' whenever someone reads the C page, ``blueeep'' whenever someone reads the page on the GSM 06.10 speech compression algorithm, etc: I can hear what's going on in my document subtree. (In addition, the text after the # is printed on the server's standard error output.)
The whole project was inspired by Chuck Musciano's simpler suggestions for generating Audio Feedback From Your HTTP Daemon.