AIPS HELP file for NFILES in 31DEC09
NFILES
Type: Adverb (Scalar)
Use: Specifies the number of tape files used in the operation.
In most uses, NFILES = 0 means to position the tape at
the start of the current file, NFILES = n (n > 0) means
position the tape just after n end-of-file marks from the
present position, and NFILES = m (m < 0) means position
the tape at the start of the m'th file preceding the
current file.
Null value: None