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| USN | |||
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| Update Sequence Number (In Active Directory replication, a 64-bit counter that is maintained by each Active Directory domain controller. At the start of each update transaction (originating or replicated) on a domain controller, the domain controller increments its current USN and associates this new value with the update request) | |||
| Update: 5 phrases in 3 subjects |
| Abbreviation | 3 |
| Computer networks | 1 |
| Software | 1 |