Unbeknownst to me until just now, you can click on the OS X login window to get more information. As noted above, if you click on the computer name, the following can be shown. With each click a new item is shown:
- Computer Name (default)
- Version
- Build
- Serial Number
- IP Address
- “Network Accounts Unavailable” (?)
- Date and Time
I accidentally clicked there moments ago and was surprised to see something happen. Cool.

