PREFIX files are used by TROFF to define standard macros and setup default
configurations. All current prefix files define the tilde character to be
equivalent to an escape.

Standard macros (which take one or more string arguments) include:
	BLD	TEXT IN BOLD TYPE
	FAINT	TEXT IN FAINT TYPE
	UL	TEXT UNDERLINED
	NORM	NORMAL LOWER CASE CHARACTERS
	LINE	LINE DRAWING CHARACTERS
	ALT2	ALTERNATE CHAR SET 2
	ALT3	ALTERNATE CHAR SET 3
	SUB	SUBSCRIPT
	SUPER	SUPERSCRIPT
	PAIR	SUPER/SUBSCRIPT
	HEX	FULL COMBINATION - NOT YET IMPLEMENTED

Some stndard macros do not include arguments within the macro call. These
include:
	SBLD	Start Bold Text
	NV	Start Normal Video/Text

