something about IPO

IPO by the means of Introduction=以介紹方式上市
It can be used only for special circumstances e.g. the company was already listed in GEM
http://www.hkgem.com/Company/CountDoc.asp?file=/listedco/listconews/gem/20030630/GLN20030630023_C.pdf
Introduction

An application for listing of securities already in issue where no marketing arrangements are required.
To find out more about the different methods of listing, please refer to the following:

圖片參考：http://www.hkex.com.hk/image/link_1_level_bullet.gif
Chapter 7 of the Main Board Listing Rules on Method of Listing

圖片參考：http://www.hkex.com.hk/image/link_1_level_bullet.gif
Chapter 10 of the GEM Listing Rules on Method of Listing

Chapter 7 (extract)
7.13 An introduction is an application for listing of securities already in issue where no marketing arrangements are required because the securities for which listing is sought are already of such an amount and so widely held that their adequate marketability when listed can be assumed.
7.14 Introductions will normally be appropriate in the following circumstances:-
(1) where the securities for which listing is sought are already listed on another stock exchange;
(2) where the securities of an issuer are distributed in specie by a listed issuer to the shareholders of that listed issuer or to the shareholders of another listed issuer; or
(3) where a holding company is formed and its securities are issued in exchange for those of one or more listed issuers. Any reorganisation by way of scheme of arrangement or by any other means whereby securities are issued by an overseas issuer in exchange for the securities of one or more listed Hong Kong issuers and the listing of the latter issuer or issuers is withdrawn at the same time as the securities of the overseas issuer are listed must first be approved by a special resolution of the shareholders of the listed Hong Kong issuer or issuers.
7.15 An introduction will only be permitted in exceptional circumstances if there has been a marketing of the securities in Hong Kong within the six months prior to the proposed introduction where such marketing was made conditional on listing being granted for those securities. Furthermore, there may be other factors, such as a pre-existing intention to dispose of securities, a likelihood of significant public demand for the securities or an intended change of the issuer’s circumstances, which would render an introduction unacceptable to the Exchange. An introduction will not be permitted if a change in the nature of the business is in contemplation.
7.16 An issuer should apply to the Exchange as early as possible to obtain confirmation that an introduction will be an appropriate method of listing. The application must state the names and holdings of the ten largest beneficial holders of the securities (if known) and the total number of holders. A copy of the share register may be required by the Exchange. In addition, particulars of the holdings of the directors and their associates must be included. If such approval to the method of listing is given, it does not necessarily mean that listing for the securities will ultimately be granted.
7.17 An introduction must be supported by a listing document which must comply with the relevant requirements of Chapter 11.
You can check the meaning from:
http://www.hkex.com.hk/glossary/glossary.htm
http://www.investorwords.com/
http://www.sfc.hk/sfc/html/EN/inutilbar/glossary/glossary_3rd_edition_2004.html
IPO. The first sale of stock by a company to the public.