Windows 10 build 14393 (rs1 release)

Windows 10 build 14393 is the official RTM build of Windows 10 Anniversary Update. It was released on 18 July 2016 to Windows Insiders that were on the Fast ring, then to the Slow ring users on 20 July 2016, then to the Release Preview ring on 28 July 2016, and then finally released to the general public on 2 August 2016.

Seconds on Clock's Taskbar
The secret seconds on clock's taskbar can be enabled by applying this registry

Old User Account Control Prompt
The Old Windows 8 like User Account Control Dialog style can be enabled by applying this registry

Console Login Prompt
The Console Login prompt is a secret feature in Windows 10. It features a Command prompt like user interface rather than the Graphical User interface. It is seen on Windows Server Core.

Applying this registry tweak can enable this