I am referencing the documentation here: https://docs.intersystems.com/ens201815/csp/docbook/DocBook.UI.Page.cls?KEY=GCOS\_embedded#GCOS\_embedded_html I have embedded html within a </code></pre> If I 'w $$$displayString' outside of the embedded html, the string is written to the page as expected so I know the Macro is being defined.  I initially thought that maybe I wasn't understanding when the macros are defined and granted I'm still a little unsure, but this seems to prove that the macro should be defined and available.   Any thoughts as to why this doesn't work?</body></html>