This value tells Dreamweaver to use custom colors to color the block delimiters.
The delimiters for blocks of PHP script, which appear in red, provide an example of the effect of the customText value:
<?php
if ($loginMsg <> "")
echo $loginMsg;
?>
<blockStart name="Block Delimiter" id="CodeColor_JavaBlock" doctypes="JSP" scheme="customText"><![CDATA[<%]]></blockStart>
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Current page: http://livedocs.adobe.com/dreamweaver/8/extending/03_cus52.htm