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The message can be customized, using the wizard's control dropdown, with values the user enters into the form. For example if your form contains a fields named firstName and lastName, you can set your message to "Thank you {firstName} {lastName}". Now when a user submits the form the controls templates {firstName} and {lastName} will automatically be replaced with field values "Thank you Joe Smith". See using templates in form/doc/error actions for full details.
Another useful message is to display a link back to the form. For example the display message:
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