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