We've put the XMetaL Author Enterprise User's Guide online as WebHelp:
http://na.justsystems.com/webhelp/en/xmetalauthor/enterprise/currentversion.html. Every topic has a unique URL, so we hope that that will make things easier when we need to talk about the documentation.
This WebHelp system was created entirely in XMetaL 6.0, with no tweaking after running the Generate Output command. I'll be posting a tutorial soon about how the customization of WebHelp formatting was done.