The previous version, which debuted in January 1996, has been enhanced with more video and audio, frames, and a glossary. Throughout the text, users are invited to enter the Virtual Laboratory, in which browser applets allow control of experiments demonstrating the principles under discussion. A CD-ROM version of the textbook is planned. PHV is updated on a bimonthly basis. Current releases are browsable and back issues searchable.
Retrieved items contain bibliographic information, abstracts, and full text when available.
When full text is not available, acquisition information is given. The Economist The Web version of the weekly international news journal offers a selection of articles from the current issue, the Economist Review, a monthly books and multimedia supplement, and several surveys. The current issue's articles are accessed via a table of contents which ranges from Business and Finance to Science and technology. Some stories are also listed by region, for e.g. Britain, America, Asia and Europe. Surveys date back to June 1995 and include Survey of the Internet and Survey of the Software Industry .