@SanFrancisco, @LosAngeles;
    GIGI_behaviorType = GIGBT_NON_EXCLUSIVE;
    GIGI_numSelections = 2;
    GIGI_selection = (ChunkHandle) ChunkOf(@SelectionList);
}</PRE>
<PRE>@chunk word SelectionList[2] = {
    CITY_CHICAGO, CITY_SAN_FRANCISCO
};</PRE>
<P>
In most cases, the user will change the selections of the GenItemGroup by clicking on items. Your application may also retrieve or alter the items selected with the following messages. In many of these messages, you may have to pass an indeterminate state