Makes PowerShell claim to be an active video player & backup software - no screensaver, no standby

DisableScreensaver.ps1

$source = @'
using System;
using System.Runtime.InteropServices;
namespace Shell
{
    public static class Host
    {
        public static void DisableScreensaver()
        {
            NativeMethods.SetThreadExecutionState(ExecutionState.DisplayRequired);
            NativeMethods.SetThreadExecutionState(ExecutionState.SystemRequired | ExecutionState.AwayModeRequired | ExecutionState.Continuous);
        }
        public static void EnableScreensaver()
        {
            NativeMethods.SetThreadExecutionState(ExecutionState.Continuous);
        }
    }
    internal static class NativeMethods
    {
        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        internal static extern ExecutionState SetThreadExecutionState(ExecutionState asFlags);
    }
    [Flags]
    public enum ExecutionState : uint
    {
        SystemRequired = 1,
        DisplayRequired = 2,
        UserPresent = 4,
        AwayModeRequired = 0x40,
        Continuous = 0x80000000
    }
}
'@
Add-Type $source
$limit = (Get-Date).AddHours(9)
while ((Get-Date) -lt $limit) {
    [Shell.Host]::DisableScreensaver()
    Start-Sleep -Seconds 5
}