LIBRARY users will be able to have access to the vast information contained in the Urban Council Public Libraries with the implementation of a new CD-ROM (Compact Disc-read only memory) network system. The system is the first of its kind in Hong Kong involving a large number of sites for the shared use of CD ROMs, Ms Carlye Tsui, the vice-chairman of the Urban Council Libraries Select Committee said. CD-ROM search service was first introduced in the council's reference libraries in October 1989. Since then, it has been used regularly by library users to obtain locate up-to-date information. ''With the expansion of the system, users of the council's district and reference libraries can now simultaneously search the 28 CD-ROMs that have been mounted on the network''. Urban Council Public Libraries included in the system are City Hall Reference library, Kowloon Central Library, Arts Library, and district libraries in Aberdeen, Chai Wan, Lockhart Road, North Point, Quarry Bay, Shek Tong Tsui, Fa Yuen Street, Lai Chi Kok, Ngau Chi Wan, Ngau tau Kok, Po On Road, Shui Wo Street, To Kwa Wan and Yau Ma Tei. ''The network system will be continually expanded to include more CD-ROM titles and terminals for public access,'' Miss Tsui said. ''We also plan to provide on-line search facility to overseas databases through this network system at the end of this yearto further enhance our search facilities.''