GCG Stacks: a friendly interface for the GCG programs.

A 'PLUS' stack which provides a friendly user interface for the GCG suite of programs is presented. The interface takes advantage of the whole set of programming tools available in a graphical and object-oriented environment and its major features include: (i) an efficient management of the on-line help documents, and (ii) a flexible editor for macrocommands. The former facilitates finding specific information in the huge documentation bundled with the GCG suite, and the latter is useful whenever several GCG programs must be run in sequence with automatic piping of the intermediate results.