maggie_rose,
Try to find a US immigration attorney who has good experience with abandonment issues (they may be hard to find) and have a consultation to review the facts of your situtation and get some advice on what to do and what to not do to find out what your present US immigration status might be.
For sure you do not want to do something that might cause CIS or CBP to wake up and make a determination that you don't want them to make if you can avoid it.
Yodrak
QUOTE(maggie_rose @ Oct 31 2006, 02:58 PM)

Hi > I received my green card back in 1982 and although I did live in the US for a period of 6 years, most of the time I have actually resided and worked in Wales. I've now decided that I want to return to the US and wonder if this is pssible to do so (I have never filed income tax returns etc)?! I have never been questioned when I've been to the US on holiday, by the border control, about my alien card or social security number?
Any ideas?