Epson TM-T88V-DT Technical Reference Manual page 66

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From [Start]-[All Programs]-[Accessories], right-click "Command Prompt" and click
"Execute as Administrator".
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The "User Account Control" screen is displayed. Click [Yes].
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Execute the following commands.
powercfg /h on
It becomes possible to select Windows hibernation in the Windows power options.
Chapter 3 Windows Settings
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