[Sleuth255]

this works pretty good:

Code:

Add-Type @"
  using System;
  using System.Runtime.InteropServices;
  public class SFW {
     [DllImport("user32.dll")]
     [return: MarshalAs(UnmanagedType.Bool)]
     public static extern bool SetForegroundWindow(IntPtr hWnd);
  }
"@

$NetflixStreaming = $false
while (1)
{
    Start-Sleep -Seconds 2
    $test = Get-Process -processname netflixbmc_utility*
    if ($NetflixStreaming -eq $true -and $test.id -eq $null)
    {
        $test = Get-Process -processname chrome*
        foreach($proc in $test)
        {
           if ($proc.mainwindowtitle.length -gt 0)
           {
               [SFW]::SetForegroundWindow($proc.mainwindowhandle)# activate it
               [System.Windows.Forms.SendKeys]::SendWait("%{F4}") #send alt F4
           }
        }
        $NetflixStreaming = $false
        $proc = Get-Process -processname kodi*
        if ($proc.id -ne $null)
        {
               [SFW]::SetForegroundWindow($proc.mainwindowhandle)# activate Kodi
        }
    }
    if ($NetflixStreaming -eq $false -and $test.id -ne $null)
    {
        $NetflixStreaming = $true
    }    
}