A complete description of the user documentation system is given in the ``La Palma Users' Documentation Guide''. In summary, the documentation consists of
a) this Observers' Guide
b) a series of User Manuals
c) a series of Technical Notes
The User Manuals provide detailed information on the operation of the telescopes, instruments and detectors, whereas the Technical Notes contain information on a wide range of topics. A full list of current Manuals and Technical Notes is given in Appendix .
Much of the documentation, including manuals for the major instruments is available to users of the World-Wide Web. The documents are held in Hypertext Markup Language (html) on the Cambridge and ING Sun clusters. The Uniform Resource Locator (URL) for the ING information system on the Cambridge cluster is http://www.ast.cam.ac.uk/%7Elpinfo/, and on the ING cluster it is http://ing.iac.es/.