Keep windows system busy (as if user working) to prevent it from sleeping, auto-logoff, powering down etc.

Start-KeepAwake.ps1

# Prevent the system from sleeping
Add-Type -TypeDefinition @"
    using System;
    using System.Runtime.InteropServices;
    public class PowerUtilities {
        [DllImport("kernel32.dll", SetLastError = true)]
        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;
    }
"@

# Prevents the system from sleeping and the display from turning off
[void] [PowerUtilities]::SetThreadExecutionState([PowerUtilities]::ES_CONTINUOUS -bor [PowerUtilities]::ES_SYSTEM_REQUIRED -bor [PowerUtilities]::ES_DISPLAY_REQUIRED)

# Keep script running indefinitely (or for a desired duration)
Write-Host "PC is awake. Press Ctrl + C to stop."
while ($true) {
    Start-Sleep -Seconds 360
}