In article <9310042017.AA26812@fegmania.wustl.edu> you write:

vat is available from ftp.ee.lbl.gov. There's no source at the moment but there are binaries for different architectures. (And the dynamically linked SunOS 4.1.x versions do work for Solaris 2.x)

vat is intended for use as a IP multicast multi-user chat program, but I believe that it is useable for point-to-point communication also. Using it for IP Multicast may require kernel patches (depending on your OS).

There's also nevot, last seen in gaia.cs.umass.edu:~ftp/pub G -- Personal mail to gtoal@gtoal.com (I read it in the evenings) Business mail to gtoal@an-teallach.com (Be careful with the spelling!) Faxes to An Teallach Limited: +44 31 662 4678 Voice: +44 31 668 1550 x212