char_conversion(+InChar, +OutChar) ISOcurrent_char_conversion(?InChar, ?OutChar) ISOcurrent_op(?P,?T,?A) ISOdisplay(+T)format(+C,:A)format(+S,+C,:A)op(+P,+T,+A) ISOuser:portray(+T) hookprint/[1,2] and write_term/[2,3] what to do
portray_clause(+C)portray_clause(+S,+C)print(+T) hookableprint(+S,+T) hookableuser:portray/1 or write/2
read(-T) ISOread(+S,-T) ISOread_term(-T,+O) ISOread_term(+S,-T,+O) ISOwrite(+T) ISOwrite(+S,+T) ISOwrite_canonical(+T) ISOwrite_canonical(+S,+T) ISOread/[1,2]
writeq(+T) ISOwriteq(+S,+T) ISOwrite_term(+T,+O) ISO,hookablewrite_term(+S,+T,+O) ISO,hookable