If you check the new Create Alexa Smart Home device for this computer checkbox, you'll get an Alexa Smart Home device that you can use to:
"Alexa, set X volume to 50 percent" - run the volume control command with 50 (for example) as the parameter
"Alexa, unmute X" - runs the mute control command with unmute or mute as the parameter
"Alexa, turn on X" - sends a Wake-on-LAN magic packet from your local Echo device to turn on your computer
"Alexa, turn off X" - runs the shutdown command
X is your computer's voice word, or its name if you don't have a voice word for it.
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To enable Wake-On-LAN, enable it in your BIOS and test it, then enable it like this:
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