I have used the utility "More Internet" to allow me to open XChat (0.12)
from an IRC link in safari or other web browsers. More Internet allows
you to configure the OS to open certain programs based on the
protocol, like an ftp client for an ftp:// link. After I installed Tiger, it quit
opening XChat. I contacted More Internet and they said if XChat
doesn't have a 'creator code', it won't work.
More Internet Homepage: http://www.monkeyfood.com/software/