G-Cows is a software project consisting in:
definition of a scripting language designed for creation of web sites (Cows);
interpreter for the scripting language (Cows);
a makefile generator (Cows-mkgen).
Cows is the interpreter for the Cows scripting language; it is used to parse HTML files containing additional scripts; its output is represented by a verbatim copy of text file with scripts replaced by their outputs. You can run Cows on every text file, but some functions are specific to web pages so - for the sake of simplicity - throughout this manual we'll assume to deal with HTML files.
This manual can be downloaded from http://www.g-cows.org/.