It is a nongovernmental forum modeled on the grand jury system in the US. There is more info at their home page: www.grand-jury.net Grand juries are less formal than actual trials. This is from findlaw.com:

Grand juries will work closely with the prosecutor, who will explain the law to the jurors. The jurors then have the power to view almost any kind of evidence they wish and to interrogate anyone they like. The procedure for grand jury hearings is relaxed to allow the jurors as much flexibility as possible. Typically, the parties that appear before a grand jury do not have attorneys, and the rules of evidence permit much more evidence than is allowed at a criminal trial.

It is a nongovernmental forum modeled on the grand jury system in the US. There is more info at their home page: www.grand-jury.net