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Files in the BNU spool directories
that have filenames beginning with the characters D.
are data files.
Data files are created when it is specified in the
command line to copy the source file to the spool directory.
The names of data files have the following format:
D.systmxxxxyyy
where systm is the first five characters in the name of the remote computer and xxxx is a four-digit job sequence number assigned by uucp. The four digit job sequence number may be followed by a sub-sequence number, yyy, which is used when there are several D. files created for a work (C.) file.
One of the data files in the BNU spool directories is an authentication file. The authentication file is an encrypted (that is, non-readable) file that contains information needed for the authentication and identification of remote users making uux requests. The file is interpreted by uuxqt.