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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: 

svy-click='handlers.onActionMethodID($event)'

If you need to make one manually you can also do that by using the $utils factory service

$utils.createJSEvent(e,"onselectionchanged")

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documentingHandlers documentingHandlers

Documenting handlers and handler templates

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