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The NTag property is a numeric field that you can associate with the control. It can be used for a variety of reasons, including voice enablement, but it is up to you how you use this field.
To specify an NTag for a control:
Enter the desired numeric value in the NTag field on the General page of the object’s Properties view.
The NTag property takes a long value. The following example assigns a numeric tag value of 30 to a single line edit box:
sle_1.ntag = 30
