the code
is too specific to be of much general use!
<p>
What if we want to double some other variable instead?  The code below
shows how to do that.
<p>
<TABLE SUMMARY="Example" BORDER="0" BGCOLOR="#efefef" WIDTH="100%">
<TR>
<TD>
<PRE>
<font color="#82140F">
`double &amp;.value.'
{
    \.word1. = {rpn \.word1. 2 *}      # line 3
}
.x. = 10                               # line 5
double &amp;.x.
.y. = 3.14
double &amp;.y.
</font></PRE>
</TD>
</TR>
</TABLE>
<p>

At line 3 Gri interprets the `<font color="#821