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CONGEN is implemented using Fortran 77, the FLECS Fortran preprocessor, and C. All code is passed through a C preprocessor in order to handle conditional compilation. In general only standard features of the languages are used, but this rule is violated when there are strong reasons for doing so. (For example, the six letter maximum length of identifiers in Standard Fortran is far too onerous to bear, so the C limit of 31 characters is used, and there is a tool, makeshort, which can generate C preprocessor definitions to reduce the size of the variables to whatever machine dependent limits are necessary).
The management of revisions is done using RCS, the Revision Control System. We use version 5.5 obtained from the Free Software Foundation. Every source file should be kept under RCS control.