The EXOSAT database and archive provides on-line access to the results and data products (spectra, images and light curves) from the EXOSAT mission as well as access to data and logs from other missions (e.g., EINSTEIN, COS-B, ROSAT and IRAS). The system is mission-independent and includes timing, image processing and spectral analysis packages as well as software to allow transfer of analysis results and products to the user's home institute. In addition, some familiar optical, IR, and X-ray catalogs, including the HST Guide Star Catalog, are available. EXOSAT allows statistical studies to be performed on large samples of astronomical objects and to retrieve scientific and bibliographic information on single sources. The complete database is located at the EXOSAT observatory at ESTEC, and is accessible via SET HOST EXOSA0 (29343), EXOSAT (28703), or ESISXO (29304), or via telnet to exosat.estec.esa.nl. Preregistration is necessary: username and address are requested during the first login. Send inquiries to request@exosat.estec.esa.nl. [References: White and Giommi (1991), Osborne (1992), Reynolds and Parmar (1993).]