C# Definition:

/// <summary>
/// Specifies whether collation should be used when printing multiple copies.
/// </summary>
internal enum DMCOLLATE : short
{
   /// <summary>
   /// Do not collate when printing multiple copies.
   /// </summary>
   DMCOLLATE_FALSE = 0,

   /// <summary>
   /// Collate when printing multiple copies.
   /// </summary>
   DMCOLLATE_TRUE = 1
}

Notes:

None.