Training & Support GBBopen users are encouraged to contact us at support@GBBopen.org. Bugs should be reported to bugs@GBBopen.org. Annotated Blackboard-System Bibliography The Annotated Blackboard-System Bibliography of classic papers and articles provides a good overview of the literature. (Some if these papers are available on line.) GBBopen Tutorial You did take a look at the GBBopen HyperTutorial, correct?