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Your question is an interesting one. I researched this article on The Be'urei Hatefilah site (I highly recommend it, as it's one for the best resources on the web for Tefillah-related articles and insights.) My understanding is that there is some controversy. I recommend you read the whole article, but I will excerpt Sefer Avudraham - Dinei Kri'at ...
After the Amida on Kol Nidrei night, there are a few paragraphs of Selichot that are said. The 3rd or 4th starts with the words Omnon Ken - and the Aaron HaKodesh is opened while saying it - hence "pesicha of Omnon Ken". It's on page 175 of the Interlinear ArtScroll Yom Kippour Machzor, Ashkenaz edition.
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