PowerShell - Executing PowerShell on Computer Lock

PowerShell can respond to system events such as locking or unlocking a session. Here is a fun sample.

Provided you have your sound card turned on, your computer will say good-bye when you press WIN+L and welcome you back when you log on again.

function Start-Fun {
  $null = Register-ObjectEvent -InputObject (\[Microsoft.Win32.SystemEvents\]) -EventName "SessionSwitch" -Action {
    Add-Type -AssemblyName System.Speech 
    $synthesizer = New-Object -TypeName System.Speech.Synthesis.SpeechSynthesizer
       switch($event.SourceEventArgs.Reason) {
    'SessionLock'    { $synthesizer.Speak("See you later $env:username!") }
    'SessionUnlock'  { $synthesizer.Speak("Hey, welcome back $env:username!") }
    }
  }
}
function End-Fun {
    $events = Get-EventSubscriber | Where-Object { $\_.SourceObject -eq \[Microsoft.Win32.SystemEvents\] }
    $jobs = $events | Select-Object -ExpandProperty Action
    $events | Unregister-Event
    $jobs | Remove-Job
}