The presentation of the image of the evolution of the Computer Catalogue of the JU Libraries Collections against the background of twenty years of digitalization of the Jagiellonian Library, included in this article, is an attempt to sum up all the undeniable benefits from applying new technologies and improving digital tools, which concern both the users and the staff of libraries. The gradual elimination of manual procedures in favour of the automatic ones has definitely improved the not only the comfort and opportunities of creating information, but also those of searching for it. The interlibrary cooperation in the field of creating and exchanging information, together with the current system of links between digital catalogues, databases, digital repositories, and multibrowsers, have allowed the contemporary library to go far beyond its physical boundaries. Modern technologies and new methods of data presentation constitute a new dimension of access to information. The continuously blurring borders of the form and contents of library materials as well as the geographic boundaries within which information is searched for, provoke thought regarding not only the historical transformations which have already taken place, but also future prospects. What direction should the changes take so that the new philosophy of building library databases meets both the needs of their users as well as the interests of various institutions, and, that the improvements result in the establishment of complete, coherent and factual sources?