sed into the newcommand.  This
is a akin to the scheme called "call by value" in some programming
languages.  Gri also provides a syntax, borrowed from C++, that permits
a newcommand to alter the contents of variable or synonym arguments.
<p>
The technique is simple.  To permit a newcommand to modify an argument
that is a variable or a synonym, just put a `<font color="#82140F"><code>&amp;</code></font>' to the left of the
item on the calling line.  Then, within the newcommand, the
corresponding local synon