One of the primary functions of the HelpTag software is to convert your marked-up files into a run-time format that the Help System understands. Text is formatted by specifying particular attributes such as type family, size, slant, and weight. A font scheme is simply a name, like an alias, that the Help System uses to assign fonts to HelpTag elements such as heads, procedures, lists, and so forth. It provides a way to map a group of text attributes used by the Help System with specific fonts.
Applications that use the standard Common Desktop Environment fonts do not need to define additional font resources. If your application relies on a different set of fonts, you must create and add a font scheme to your application.
DtStdInterfaceFontNames (5) man page
DtStdAppFontNames (5) man page