The value of the help search path (DTHELPSEARCHPATH) is created by assembling
the following locations, listed in order of precedence:
Locations specified using the DTSPUSERHELP variable
Locations derived from the DTSPUSERAPPHOSTS variable
The default personal location: HomeDirectory/.dt/help
The default location: /etc/dt/appconfig/help/language
Locations specified using the DTSPSYSHELP variable
Locations derived from the DTSPSYSAPPHOSTS variable
/usr/dt/appconfig/help/language