This is an old revision of the document!
The Shutdown command does a controlled shutdown of the device's FreshTomato firmware. After shutdown, the FreshTomato router/device will power off. Not all models/hardware/platforms will poweroff. The command halt results in halting the machine only (leaving power on) for many devices. You must power cycle the router to power it back up.
Since Release 2020.8, Shutdown will prompt a second popup to confirm the selection. This was introduced to differentiate visually from the reboot function, since the two links sit next to each other. The wrong button could potentially be clicked by mistake.