I am guessing he has domain registered with multiple registrars. I say, switch them all to GoDaddy, then no software needed.
The software would still be needed.
It gets more complicated than you guys probably care to know, but here's one example: Domain names cannot be transferred within the first 60 days of ownership, no matter where you buy them. This software will tell you at a glance what Registrar the names are with so you know which names need to be transferred to your favorite registrar (
not GoDaddy, by the way
) after the 60 day waiting period.
Also, if a domain name you own gets swiped (hey, it happens) you need a way to know about it. This software lets you see stuff like that.
There are lots more examples, but I guess it doesn't matter since I've decided that I'll most likely need Windows XP for other things, so I'll need to use Parallels either way. And if I'm using Parallels, I might as well run this program on it too.