File: Core\CSharp\System\Windows\Input\InputMode.cs
Project: wpf\src\PresentationCore.csproj (PresentationCore)

using System;
namespace System.Windows.Input 
{
    /// <summary>
    ///     The mode of input processing when the input was provided.
    /// </summary>
    public enum InputMode
    {
        /// <summary>
        ///     Input was provided while the application was in the
        ///     foreground.
        /// </summary>
        Foreground,
 
        /// <summary>
        ///     Input was provided while the application was not in the
        ///     foreground.
        /// </summary>
        Sink
    }
}