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The "private" configuration makes the handler only accessible from Server Side Scripting, not from the client/browser itself.
The "ignoreNGBlockDuplicateEvents" configuration makes the handler ignore the system NG_BLOCK_DUPLICATE_EVENTS property.
A handler can have a JSEvent property type which is able to map a Dom event to a JSEvent object that the handler can have in Servoy scripting. A mapping is mostly made automatically by calling using in the template:
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