Core Documentation

Detected by the mainscript "index.php" looking for the var "formtype_db" to be set. (could be the submit-button)

Input MUST be POST method. And the REFERER and HTTP_HOST must match. To setup a script to handle the input, refer to the FE_DATA object.

See examples from the typo3/sysext/cms/tslib/media/scripts/ folder, eg. "guest_submit.inc"