An MTCN (Money Transfer Control Number) is a Western Union tracking number issued to you upon submission of your transfer. This is a unique reference number assigned to your specific transaction. If you've requested a cash pickup, your recipient will need to submit the your MTCN before they can receive funds.
Similarly, an RTRN is a specific code used for Remit2India transactions. It stands for Remittance Transaction Reference Number. You'll only receive it when sending money through Remit2India.