Swap process windows repeatedly and bring process windows to foreground.

WindowSwapper.ps1

$code = @"
    [DllImport("user32.dll", SetLastError=true)]
    public static extern void SwitchToThisWindow(IntPtr hWnd, bool fAltTab);
    
    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool SetForegroundWindow(IntPtr hWnd);
"@

$win = Add-Type -MemberDefinition $code -Name SwitchWindow -Namespace SwitchWindow -PassThru

Function Get-RandomHandle {
    Get-Process | 
        Where-Object { $_.MainWindowHandle -ne 0 } | 
        Select MainWindowHandle, Name |
        Get-Random
}

Function Swap-Window {
    param([int]$Seconds=5)
    $proc = Get-RandomHandle
    Write-Host "Swapping to process: $($proc.Name) - handle: $($proc.MainWindowHandle)..."
    $win::SwitchToThisWindow([System.IntPtr]$proc.MainWindowHandle, $true)
    Sleep $Seconds
}

Function Set-ForegroundWindow {
    param([int]$Seconds=5)
    $proc = Get-RandomHandle
    Write-Host "Setting Foreground to process: $($proc.Name) - handle: $($proc.MainWindowHandle)..."
    $win::SetForegroundWindow([System.IntPtr]$proc.MainWindowHandle)
    Sleep $Seconds
}


Set-ForegroundWindow | Out-Null
# or worse
While ($true) { Swap-Window | Out-Null }