charles cashion

I just looked into /tmp
I just played with mkisofs and created backup.iso
and wanted to see /tmp/backup.iso
I found 18 copies of keyring-??????
All of them contain directory "socket"
/tmp/keyring-??????/socket
All of the socket directories are empty (size 0)
One of them is dated today (25may08)
My question(s)
1. what generates these?
2. what uses them?
3. Can I delete them?
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cc