restore session data after payment

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I am about writing a bank gateway payment module. I'm looking for the proper way to restore the session information when the bank send me back the customer. Actually I finish always at the login page, because of the lost session ID (I think).

I think I missed something, 'cos reviewing the in-built payment modules (ipayment, authorizenet) they also refer the relay/redirect/return URL as is, so without any session ID parameter, and even I can not give any URL parameter in the returning URL data field I have to send to the bank gateway.

So please light me up how to manage the returning cutomer at the checkout_process stage of the checkout.

Thank you in advance any help/tips.