Formhandler needs to store some values in the session to be able to access them after the form has been submitted.
It is possible to control, which session mechanism Formhandler uses via TypoScript.
To access the data via TypoScript you have to use Session\TYPO3.
Stores the data in a PHP session.
Uses the session mechanism of TYPO3 to store and retrieve the data. To access session data in TypoScript, you have toSpecify your own uniqueID for a form Use Session\TYPO3 instead of the default Sessi...