To run Document, you must have perl installed. You may also need a compiler if you want to process the source code, and a formatter if you want to process the Document output (documentation) file.
To generate the documentation for Document in PostScript, you will need LATEX2e, makeindex and dvips. To generate the documentation in HTML you will need LATEX2e, makeindex, gnu tar, and LATEX2HTML, which requires ghostscript, netpbm, and perl, version 5.
The HTML version will look better if LATEX2HTML v.98.2beta8, (or later) is used.