Set STES so machine won't sleep

Enable-STES.ps1

# import kernel32 calls we need
# note screen saver will not enable either
# can remove the display required flag to remove that
Add-Type -Name n -Namespace ns -MemberDefinition @'
    [DllImport("kernel32.dll")]
    public static extern uint SetThreadExecutionState(uint esFlags);
    public const uint ES_CONTINUOUS = 0x80000000;
    public const uint ES_SYSTEM_REQUIRED = 0x00000001;
    public const uint ES_DISPLAY_REQUIRED = 0x00000002;
    public static string StayAwake(){
        var flags = ES_CONTINUOUS | ES_SYSTEM_REQUIRED | ES_DISPLAY_REQUIRED;
        var retval = SetThreadExecutionState(flags);
        return retval.ToString();
    }
'@

# continually enables stes every 90 seconds for this process
function Enable-STES(){

    while($true)
    {
        $fPreviousExecutionState = [ns.n]::StayAwake();
        "`$fPreviousExecutionState = $fPreviousExecutionState"
        Start-Sleep -Seconds 90

    }

}

# don't go to sleep!
Enable-STES