This is the original interface generator developed by the Isthmus project. Isthmus is a tool which takes a class dictionary defined by a user and a Demeter generated environment and implements the interface code required for the class dictionary to be available from a TclTk or wish shell. It is invoked by typing isthmus on the command line.
This Isthmus tool only provides the interface code necessary to call class dictionaries from a TclTk envorinment. It was designed with the intention of adding support for propagation patterns after testing proved that the interface code generated was sufficient for all possible uses of class dictionaries.