The applications of the Daisy WhoIs are basically very simple and all involve checking who owns a particular web site.
The program can also used to check if a particular domain name has been registered.
Note that the check may not be totally correct, as sometimes the servers are a few days behind reality.
The Daisy WhoIs is also a valuable tool to lookup who owns the domain responsble for spam or the associated domain of phishing e-mails.
Note that the Daisy WhoIs sends direct commands to the Internet avoiding any particular web sites, except for the domain registry databases. This means that your requests are discrete and not known to the domain about which you are enquiring.