QUOTE(zyggy @ Jul 28 2006, 09:14 AM)

DF
Not quite...
The difference is this... When you first arrived into the US on a K-1, you were admitted to the US. That is your physical self and your legal self were both allowed into the US. THis is important, because only those individuals whose legal self is in the US have access to the due process and courts that our legal system provides.
When one is paroled into the US. One's physical self is permitted to be in the US, but your legal self is still at the POE waiting to get admitted. Basicially what this means that you have given up your right to access the legal system of the US to fight the USCIS in the event that the USCIS denies your AOS petition. You have in effect given up your right to appeal an adverse decision. All they have to do once you are denied is escort you to the nearest plane to reunite your physical self with your legal self...
If your AOS is successful, you are admitted to the US as a permanent resident. It's no difference as if you went to the POE with an immigrant visa.
Zyggy, I just came across this post and am not at all sure that it is entirely accurate.
I just did a bit of research on this issue and noticed that "continuous legal presence" in the US since the filing of the adjustment of status petition is one of the legal requirements for qualification. Congress provided a narrow exception to the physical presence requirement by directing that "an alien shall not be considered to have failed to maintain continuous physical presence in the United States for the purposes of sub paragraph (A) by virtue of brief, casual, and innocent absences from the United States." 8 U.S.C. 1255a(a)(3)(

. The Attorney General, by regulation, interpreted an absence to be "brief, casual, and innocent" only if the alien obtained advance parole before leaving the United States or if the departure was out of the alien's control. 8 C.F.R. 245a.2(

(6). "Advance parole" consists of the Attorney General's regulatory pre-authorization for an alien to be paroled into the United States upon arrival at the border without the appropriate visa or other documents necessary to enter lawfully. 8 C.F.R. 212.5(f).
The Board of Immigration Appeals (Board) has interpreted the statutory exception to the continuous physical presence requirement for "brief, casual, and innocent absences" as only preserving the alien's eligibility for legalization under the Immigration Reform and Control Act, and not as a substantive redefinition of an entry into the United States for other immigration purposes. In re Singh, 21 I. & N. Dec. 427, 434-435 & n.8 (1996) (en banc).
What this appears to mean is that for the purposes of the applicable AOS statutes, authorized brief, casual, and innocent absences are not deemed legal "departures" and/or "readmissions" to/from the US, meaning that your "legal" self actually remains in the US during such departures. Consequently, the main difference between this and Zyggy's post above is that, based on all this information, AOS applicants who use advance parole do NOT give up the right "to access the legal system of the US to fight the USCIS in the event that the USCIS denies your AOS petition."
P.S.
Please do not misinterpret this post to mean that AOS applicants who have otherwise committed infractions of US immigration laws can leave and reenter the US with impunity if they just obtain advance parole (they can't). That issue is completely separate and distinct from the distinctions that are being discussed above.