Hi, PJ, this is quoted from your blog http://blog.wenxuecity.com/blogview.php?date=200706&postID=42162
"移民局的規定是,H 簽證使用 AP 入境,隻要仍然維持 H 身份,則不必進入 AOS 狀態。其 H 身份可以 transfer (H-1),也可以 extend (H-1/4),就象你沒有用過 AP 一樣。"
I would treat this "H 簽證" as H1B Petition Approval Notice (I797), not H1B visa stamping (you get this from US embassy). But I could not find the same rule from here the INS Memo (5-16-00):
http://www.shusterman.com/cronin51600.html
Please correct me if I am wrong.