Better english info at  http://www.noglobal.org/netenglish.htm

the site says....

"AT THREE O' CLOCK ON THE 15TH OF MARCH -  http://tradequote.fineco.it/. The target of Netstrike, that the global rights Network of Campania is going to hit, is Fineco. To render the action more effective you must connect to the site  http://tradequote.fineco.it/. Why choose a stock exchange site? The answer is an easy one. We want to show how fragile the system possessing us is. This first action (but not the last) will hit the financial market of Italy and also the international ones. During the opening of Globalforum ocse, it is important that such an action, together with physical actions, will shock the quiet of the rulers. This action doesn't want to hit Fineco directly. This company has been chosen because it is the symbol of new-economy in Italy, but we should have chosen any other stock exchange site... The important thing is to show the weakness of this system. You want surely know if Netstrike is illegal. The only unlawful action is that of organisers. Who takes part to it can not be charged with anything, because no one can show that the user was netstriking."

"To take part you must at first deactivate the cache memory of your browser. Then we will explain the stages to carry out the action, according to the different browsers....."

NB netstrike has it's own pages  http://www.netstrike.it/ (mainly in italian)