Administration > Environment Variables > APTHELPPATH — Specifying the Directory for Tag Help
  
APTHELPPATH — Specifying the Directory for Tag Help
Specifies the directory where custom tag help files are stored. Arbortext Editor searches in the specified director first for the location of tag help files, and then in the default help directories for each type (the installed doctype directory in a subdirectory called help).
If your document type is a customized one installed in your document types subdirectory, for example mydoc, the help files for this document type would be placed, by default, in the help subdirectory of mydoc.