Address_Of_Row_In_Buffer
begin_of_last_line = Address_Of_Row_In_Buffer(field, (field->drows - 1));
FIELD_CELL *bp = Address_Of_Row_In_Buffer(field, row);
bp = Address_Of_Row_In_Buffer(field, row);
prev_line = Address_Of_Row_In_Buffer(field, (form->currow - 1));
this_line = Address_Of_Row_In_Buffer(field, (form->currow));