1.   If a hacker sends many SYN packets with false addresses, the Web site will be entirely frozen, waiting for acknowledgements that never come.

2.   Just before she leaves, however, a fellow hacker sends her a disk with all kinds of indecipherable but evidently alarming data on it.

3.   Typically, such worms are sent by hackers who get thrills from vandalism.

4.   Tanner, whose company sells hip golf clothing, said he first learned of the security breach Monday when the hacker sent him e-mail outlining the extortion attempt.

5.   The same hackers also sent virus-infected electronic messages to several thousand Internet subscribers through a U.S. server, BTA said.