Sentence:  More astounding still is the volume of trading, as a manic afternoon sees Netscape shares change hands 13.88 million times; an average of almost two and a half times each, with some <WSD>racqueted</WSD> back and forth like tennis balls . . . a curious pattern which will become familiar to dotcom stock-watchers. 
Meaning of the word marked with <WSD> tags:  To exchange back and forth, similar to the way a tennis ball volleys back and forth.