The following needs to be run on each computer if using a workgroup setup. or changed in your AD security policy (to make it permanent – which isn’t advisable without signing the script)

https://www.howtogeek.com/117192/how-to-run-powershell-commands-on-remote-computers/

Enable-PSRemoting
Set-executionpolicy unrestricted
Set-Item WSMan:\localhost\Client\TrustedHosts -Value "192.168.1.250" -Force 
Get-Item WSMan:\localhost\Client\TrustedHosts
Restart-Service WinRM

The above does the following:
Enable-PSRemoting sets up the policies and firewalls to allow remote connections using powershell
Set-executionpolicy unrestricted changes the local execution policy to allow execution of all scripts (not just signed)
Set-Item WSMan:\localhost\Client\TrustedHosts -Value "192.168.1.250" -Force Adds server IP into the trustedhosts to allow execution
Restart-Service WinRM restarts windows remote management service

We are assuming that your server IP is 192.168.1.250, change as appropriate

Now to the actual shutdown code that will be run from our “Server”:

Function Get-MyCredential{
 param(
 [string]$username,
 [string]$password
 )

 $secStr = new-object -typename System.Security.SecureString
 $password.ToCharArray() | ForEach-Object {$secStr.AppendChar($_)}
 return new-object -typename System.Management.Automation.PSCredential -argumentlist $username,$secStr
}
Function Lock-Machine{
 param(
 $machineName
 )

 & winrm set winrm/config/client `@`{TrustedHosts = `"$machineName`"`}
 Invoke-Command -ComputerName $machineName -ScriptBlock { tsdiscon.exe console } -Credential (Get-MyCredential User Pa$W0rd)
 }
Function Hibernate-Machine{
 param(
 $machineName
 )

 & winrm set winrm/config/client `@`{TrustedHosts = `"$machineName`"`}
 Invoke-Command -ComputerName $machineName -ScriptBlock { &"$env:SystemRoot\System32\rundll32.exe" powrprof.dll,SetSuspendState Hibernate } -Credential (Get-MyCredential Administrator password)
}
Lock-Machine "192.168.1.84"
#Lock-Workstation "NameOfTheComputer" (Get-Credential)
Stop-Computer -ComputerName 192.168.1.85 -Force -Credential (Get-MyCredential User Pa$W0rd)

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