Next: The Portable-CGS4DR Graphical User Interface . ... In order to track changes in the TABLES/STSDAS code, as well as for Quality Assurance and to simplify the code release process, the GNU Revision Control System (RCS) was chosen as the method of revision control. ... A survey of the Revision Control software available led to the choice of the GNU Revision Control System (RCS) as the method of revision control. ... The part of the system that the user sees is the Graphical User Interface. ...