One should not assume that any of these common blocks have been initialized unless the program uses them. Used in all programs except aces ii.f, joda.f, vmol.f and vprops.f. The location of the oldest record in the cache, which will be the first one flushed to disk when a new record must be read from the physical disk.
All variables are integers.
Used in post-SCF programs only. All values are integers. Used in all program modules. The information contained in this common block is perhaps obvious. All variables are again integers.