SCAN_BARCODE: When the scanner is used to scan a barcode, the value scanned will go here
SCAN_DATETIME: The date and time of the last scan will go here
KEY_PRESS: When the KEY PRESS card is used, the key used will go here
INPUT_NUMERIC: When the INPUT card is used, the value entered will go here
SCANNER_MODEL: Preset to the model number of the scanner running your App
SCANNER_SERIAL: Preset to the serial number of the scanner running your App
CURRENT_DATETIME: The current date and time on the scanner.
All of these default variables except SCANNER_MODEL & SCANNER_SERIAL will be blank when your App starts, until the associated Card is used.