Most of the material in this document has been extracted from the Mission Operations Report of the SXG Technical Implementation Committee. Additional information may be found in Vol. 2279 of the SPIE Proceedings Series. At this time, much of the technical information is based on theoretical calculations rather than actual measurement. This is changing rapidly as the flight models of the telescopes and their instrumentation are calibrated. Proposers are urged, therefore, to check for updates to the information contained here, as the launch of SXG approaches. These updates are likely to appear first in electronic form at the various SXG WWW sites. Useful sites to check are http://hea-www.harvard.edu/SXG/sxg.html at the U.S. SXG Coordination Facility, http://uhuru.dsri.dk/srg/srg.html at DSRI, and http://hea.iki.rssi.ru/Welcome.html at IKI.