I missed filing my taxes from 1996 to 1999. I did not have any income during and I was living in a foreign country during that time. I want to file a late return for those years to keep my tax file up to date. I have the following questions.

(a) Should I use the current address to file the prior returns? Or, should I use my address from 96 to 99?
(b) If I use the foreign address, should I file the State Tax Returns for this period? If so, which state?
(c) If I use the foreign address, how will the IRS know my current address for any correspondance?

Any help is appreciated.