The following keywords, useful for developing new methods and other debugging purposes, but not recommended for production level calculations, are described in the Gaussian 03 Programmer's Reference.
ExtraLinks
ExtraOverlays
IOp2 and its synonyms MDV and Core
IOp33
Restart
Skip
Use
The Gaussian 03 IOps Reference also documents all internal options (IOps). They are also documented at www.gaussian.com/iops.htm.