rem: return B_OK;
add: return ((code==SERVER_TRUE)?B_OK:B_ERROR);
context: set_scroll_bar_info(scroll_bar_info *info){	if (info == NULL)		return B_BAD_VALUE;	BAppServerLink link;	int32 code;		link.StartMessage(AS_SET_SCROLLBAR_INFO);	link.Attach<scroll_bar_info>(*info);	link.FlushWithReply(&code);	return B_OK;}