Who is concurrent filer?
It has always been a point of discussion what is concurrent filing:
Please refer to: 8 CFR Sec. 245.2(a)(2)(C).
It says:
(C) A visa petition and an adjustment application are concurrently filed only if:
(1) The visa petitioner and adjustment applicant each file their respective form at the same time, bundled together within a single mailer or delivery packet, with the proper filing fees on the same day and at the same Service office, or;
(2) the visa petitioner filed the visa petition, for which a visa number has become immediately available, on, before or after July 31, 2002, and the adjustment applicant files the adjustment application, together with the proper filing fee and a copy of the Form I-797, Notice of Action, establishing the receipt and acceptance by the Service of the underlying Form I-140 visa petition, at the same Service office at which the visa petitioner filed the visa petition, or;
(3) The visa petitioner filed the visa petition, for which a visa number has become immediately available, on, before, or after July 31, 2002, and the adjustment applicant files the adjustment application, together with proof of payment of the filing fee with the Service and a copy of the Form I-797 Notice of Action establishing the receipt and acceptance by the Service of the underlying Form I-140 visa petition, with the Immigration Court or the Board of Immigration Appeals when jurisdiction lies under paragraph (a)(1) of this section.
I am not sure how it translates into practice. But the question on who is concurrent will be addressed(hopefully.).