I want to know more information about practise technologies in Helsinki City Library.....such as computers, data bases, disks and others.

Have you already visited websites of Helsinki City Library (http://www.lib.hel.fi/?_lang_id=EN )? There is quite a lot of information on the subject of your inquiry.

Information about databases for customers' use you'll find here
http://www.lib.hel.fi/page.asp?_item_id=2289 .

The list of databases and book catalogues is on this site http://www.lib.hel.fi/page.asp?_item_id=2515 .

About computers and other equipment:
http://www.lib.hel.fi/page.asp?_item_id=2287 . Check especially the link "workstations".

About the library system used in Helsinki metropolitan area libraries:
http://toimintakertomus.lib.hel.fi/toimintakertomus2003/EN/page4464.htm…