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<h1>Notes</h1>
<ol><li>A variable once declared cannot be redeclared to another data
type.</li>
<li>All variable names are strings of alphanumeric characters starting with a
letter.</li>
<li>Currently, fonts are defined as any X Windows font name.  The
default font is set to "-adobe-courier-medium-r-normal--12-*", default
background colour is white, foreground and border colour is black,
border width is 0, relief is <CODE>raised</CODE>.  You
can change these defaults by redefining the EDEN variables <code>DFfont</code>,
<code>DFbgcolor</code>, <code>DFfgcolor</code>, <code>DFbdcolor</code>
and <CODE>DFrelief</CODE> respectively.</li>
<li>The operators involving the definition of row and column, i.e. <code>.r</code>,
<code>.c</code> and box constructor <code>[</code><em>point</em><code>,</code>
<em>nr</em><code>,</code> <em>nc</em><code>]</code>, relies on the font
width and font height information or the default font.  When the default
font changes, the meaning (the size) of the operators will change. 
Also, this meaning applies globally to all windows, even the windows may
have their own font defined.  Therefore, you need to be careful in
defining the size of windows, not to presume too much about the font in
use for those windows.</li>
<li>The names <code>fgcolor</code>, <code>bgcolor</code> and
<code>bgcolor</code> are synonymous of
<code>fgcolour</code>, <code>bgcolour</code> and
<code>bdcolour</code>.</li></ol>

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