indexer.conf
search.htm
ImportEnv {name}
ImportEnv creates or replaces the given variable making it available for use in other indexer.conf or search.htm commands, or as a search.htm template variable.
The value is taken from the environment variable with the same name.
ImportEnv HOME Include $(HOME)/.indexer.conf
ReplaceVar, Include, the Section called The SET operator in Chapter 10.