NOTATION
David N. Williams
Last revision:  March 8, 2002

We follow the readability convention that Forth words mentioned
in text comments are written as upper case.

We often use "."  for compound names in stack comments and
locals where "-" might normally appear in the name of a Forth
word.  We use the "&" prefix to indicate an address, and the
"Thinking Forth" convention for "#" and "/" prefixes (number of
elements and size in address units).

We use "index-style" indentation:  shorter indentation for
subordinate scope, and longer indentation for continuation of the
same line.

Embedded ( ...) stack comments are intended to clarify input for
the next word or so, not to provide a complete stack picture.

In stack comments and locals names, "list", "node", and "space"
are addresses of list, node, and node space structure instances.