A computer implemented method, and a carrier medium carrying computer code to implement the method to generate a customized "link collection" of topics and items attached to the topics related to a subject of interest to a group of people. The link collection includes items of information, provided, in one embodiment, in the form of URLs. A member of the link collection requires only a computer connected to a server system via a network such as the Internet. In one embodiment, access to the link collection is provided by a Web browser application running on the computer. The collection of attachments can be viewed and searched by a corresponding group of at least one user. The topics do not necessarily have a hierarchy, and a dynamic hierarchy may be defined in the process of a multi-step search.