Application Express :: How To Make Use Of Error Template Control

I actually have tried to read the Customizing Templates chapter of the Users Guide. According to that guide, the following substitution strings are supported in the the Error Template Control section of page templates.

#MESSAGE# and #ADDITIONAL_INFO# - Places the error message.
#TECHNICAL_INFO# - Displays detailed internal error information which will just be visible for developers.
#BACK_LINK# - Displays a link back to the previous page.
#OK# and #RETURN_TO_APPLICATION# - Returns to translated text strings.

However, if I enter the follow code

<p> message:     #MESSAGE# </p>
<p> additional info:   #ADDITIONAL_INFO# </p>
<p> techie stuff:     #TECHNICAL_INFO# </p>
<p> back link:     #BACK_LINK# </p>
[code]........

return to application: Return to application.

It appears that only the first substitution string is doing anything. I'm especially interested in additional info and technical info. The back_link just looks like an html snippet, not sure why I would use a substitution string for this. I imagine the last two could facilitate site translation, but that doesn't work much if there is no machinery for translating error messages themselves.