Over the 15 years since the VLBA dedication in 1993, many individuals have contributed to this document by writing sections, editing previous versions, commenting on draft material, and implementing the capabilities described herein. We thank all these contributors for their efforts. The listed editors of the present version of this document are the editors of the most recent revisions, and thus are the best individuals for readers to contact if they have questions on the material, or suggestions that would enhance the clarity of this guide.