1.   But attached to each packet of data is a request for the victim site to send back a response.

2.   But Roy said no personal information about users of the victim sites was compromised.

3.   And the daemons arrive at the victim site with phony return addresses, making them harder to trace.

4.   The victim computer sites get tied up and shut down, like an overloaded telephone system that gives only busy signals or no dial tone.