The asynchronous audio conferencing applet at www.wimba.com uses TCP ports 4382 and 5644. Sites wishing to explore Wimba will need to allow access for TCP transmissions on those ports. Those concerned regarding security issues should note that the signed applet has been ranked in the top 1% (and #1 overall, actually) by the JARS Java Applet Rating Service. I've sent Wimba.com the URL for the commonly known port number registration form, as those ports do not yet appear in: http://www.isi.edu/in-notes/iana/assignments/port-numbers Anyone knowing of any other uses of those ports, please mailto:[EMAIL PROTECTED]. Thanks! Cheers, James