The grand jury investigating State Sen. Vincent J. Fumo has accumulated a huge cache of evidence - some of it "scandalous, even criminal... extremely embarrassing" information about public officials or others, prosecutors say. And prosecutors want to make sure it doesn't get out. Soon, they will have to provide this evidence to the two Senate computer technicians charged with trying to thwart the FBI's investigation. In a filing, prosecutors have asked a judge to order defense lawyers not to give evidence to reporters or anyone else. If any of that evidence - 40,000 e-mails, hundreds of FBI interviews, and voluminous grand jury transcripts - got out, prosecutors said, it might unfairly embarrass others, some of whom might not even be charged. Lawyers for the two technicians oppose such an order.