What is the test for disclosing the contents of a confidential document to defense counsel at trial?

Here, after an ex parte proceeding, the court decided to allow defense counsel to know the contents of the document, to argue for the right to use it at trial and to question the complainant about it, so long as defendant himself was not told what the document said. These rulings were not an abuse of discretion. A defendant is entitled to be personally present at all critical stages of his trial if his presence would contribute to the fairness of the procedure (Kentucky v. Stincer, 482 U.S. 730, 745, 107 S.Ct. 2658, 96 L.Ed.2d 631

[907 N.E.2d 286]