using System.Windows.Input; // ... public static void FreezePenInput() { PenInput.SetPenInputEnabled(false); // disable the pen device PenInput.SetPenInputEnabled(true); // re-enable the pen device }Here, `PenInput` is the namespace that contains the `Pen Freeze` API. The code first disables the pen device by calling `SetPenInputEnabled(false)` method and then re-enables it by calling `SetPenInputEnabled(true)`. Another example could be when implementing a drawing app that requires a user to pause/suspend pen input temporarily. You could use the Pen Freeze API in your app to allow the user to freeze the pen input while they switch between different drawing tools or settings. The package library for the Pen Freeze API is `System.Windows.Input.PenInput`. This namespace is part of the `PresentationCore.dll` assembly, which is a built-in assembly in C# and doesn't require any additional package installation.