function getTag( 
   tagID : number(Integer),
   index : number(Integer),
   callback : function
) : ImGearIsisOperationStatus;

var resultVar = instanceOfImGearIsisScanner.getTag(number(Integer),number(Integer),function);

function getTagCallback(tagID, tagType, choices, tagValue, status) {
    if (status.get_status() !== ImageGear.Web.Isis.ImGearIsisStatus.Completed) {
        alert(status.get_statusMessage());
    }

    var pageSizeSelect = document.getElementById("pageSizeSelect");
    // The page sizes are provided as strings. The choices argument contains properties for getting the list of strings, integers, or numerators and
    // denominators or the minimum, maximum, and step values for a range of integers or numerators and denominators. The tagValue argument contains
    // properties for getting the current string value, integer value, or numerator and denominator values. You can check the tagType argument to
    // determine if the tag values are string, integer, or rational. You can check the choiceKind property of the choices argument to determine if
    // the tag values are provided as a range or in a list. See the ASP .NET ISIS sample for more code that demonstrates accessing the getTag callback
    // arguments for different tags.
    var stringList = choices.get_stringList();
    for (var i = 0; i < stringList.get_length(); i++) {
        var tagString = stringList.getTagString(i);
        var option = document.createElement("option");
        option.text = tagString;
        pageSizeSelect.add(option, null);
    }
}

scannerSession.get_scanner().getTag(ImageGear.Web.Isis.ImGearIsisTag.PageSize, 0, getTagCallback);