<snip>
don't know what the files that exist on a cartridge backup,and , for this 
reason, if the userid don't know the volume, is impossible restore a file, 
at least than read volume by volume
<unsnip>

Your shop sounds like a good candidate for HSM. If you HSM backup a file, 
the user only has to know the DSN to get the various available backup 
(backup or dump).
Without HSM, you could keep DCOLLECT 'D' records and determine VOLSER from 
that or DSS RESTORE the tape with NORUN and parse the SYSOUT to see if the 
DSN is on the tape. Since it's probably multifile tape, you'll have to 
account for this.
HTH 

Jack Kelly
202-502-2390 (Office)

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