got welcome message from TSC

Application Type: I485 , APPLICATION TO REGISTER PERMANENT RESIDENCE OR TO ADJUST STATUS

Current Status: Card production ordered.

On February 29, 2008, we ordered production of your new card. Please allow 30 days for your card to be mailed to you. If we need something from you we will contact you. If you move before you receive the card, call customer service. You can also receive automatic e-mail updates as we process your case. Just follow the link below to register.

This afternoon got another message like this:
Application Type: I485 , APPLICATION TO REGISTER PERMANENT RESIDENCE OR TO ADJUST STATUS


Current Status: Notice mailed welcoming the new permanent resident.

On February 29, 2008, we mailed you a notice that we had registered this customer's new permanent resident status. Please follow any instructions on the notice. Your new permanent resident card should be mailed within 60 days following this registration or after you complete any ADIT processing referred to in the welcome notice, whichever is later. If you move before you get your new card call customer service. You can also receive automatic e-mail updates as we process your case. Just follow the link below to register.

Anyone know what is ADIT processing?