When a list box has the style LS_MULTIPLESEL or LS_EXTENDEDSEL, the user can select more than one item at a time. An application must use different strategies when working with these types of lists. For example, when responding to an LN_ENTER control code, it is not sufficient to send a single LM_QUERYSELECTION message, because that message will find only the first selection. To find all current selections, an application must continue sending LM_QUERYSELECTION messages, using the return index of the previous message as the starting index of the next message, until no items are returned.