RemAttr
RemAttr(new_bkgd, A_COLOR);
RemAttr(old_char, ~A_CHARTEXT);
RemAttr(new_char, ~A_CHARTEXT);
RemAttr(SP_PARM->_slk->attr, attr);
#define SetPair(value,p) RemAttr(value, A_COLOR), \
RemAttr(attr, A_ALTCHARSET);
RemAttr(attr, A_ALTCHARSET);
RemAttr(attr, A_ALTCHARSET);
RemAttr(attr, A_ALTCHARSET);
RemAttr(thisline[j], turnon);
RemAttr(lastline[n--], turnon);
RemAttr(NewScreen(SP_PARM)->_line[p].text[q], turnon);
RemAttr(s[x], A_ATTRIBUTES);