C# Definition:

[Flags]
internal enum fModes
{
   /// <summary>
   /// When used, the DocumentProperties function returns the number
   /// of bytes required by the printer driver's DEVMODE data structure.
   /// </summary>
   DM_SIZEOF = 0,

   /// <summary>
   /// <see cref="DM_OUT_DEFAULT"/>
   /// </summary>
   DM_UPDATE = 1,

   /// <summary>
   /// <see cref="DM_OUT_BUFFER"/>
   /// </summary>
   DM_COPY = 2,

   /// <summary>
   /// <see cref="DM_IN_PROMPT"/>
   /// </summary>
   DM_PROMPT = 4,

   /// <summary>
   /// <see cref="DM_IN_BUFFER"/>
   /// </summary>
   DM_MODIFY = 8,

   /// <summary>
   /// No description available.
   /// </summary>
   DM_OUT_DEFAULT = DM_UPDATE,

   /// <summary>
   /// Output value. The function writes the printer driver's current print settings,
   /// including private data, to the DEVMODE data structure specified by the
   /// pDevModeOutput parameter. The caller must allocate a buffer sufficiently large
   /// to contain the information.
   /// If the bit DM_OUT_BUFFER sets is clear, the pDevModeOutput parameter can be NULL.
   /// This value is also defined as <see cref="DM_COPY"/>.
   /// </summary>
   DM_OUT_BUFFER = DM_COPY,

   /// <summary>
   /// Input value. The function presents the printer driver's Print Setup property
   /// sheet and then changes the settings in the printer's DEVMODE data structure
   /// to those values specified by the user.
   /// This value is also defined as <see cref="DM_PROMPT"/>.
   /// </summary>
   DM_IN_PROMPT = DM_PROMPT,

   /// <summary>
   /// Input value. Before prompting, copying, or updating, the function merges
   /// the printer driver's current print settings with the settings in the DEVMODE
   /// structure specified by the pDevModeInput parameter.
   /// The function updates the structure only for those members specified by the
   /// DEVMODE structure's dmFields member.
   /// This value is also defined as <see cref="DM_MODIFY"/>.
   /// In cases of conflict during the merge, the settings in the DEVMODE structure
   /// specified by pDevModeInput override the printer driver's current print settings.
   /// </summary>
   DM_IN_BUFFER = DM_MODIFY,
}

Notes:

VB

    Friend Enum fModes
    DM_SIZEOF = 0
    DM_UPDATE = 1
    DM_COPY = 2
    DM_PROMPT = 4
    DM_MODIFY = 8
    DM_OUT_DEFAULT = DM_UPDATE
    DM_OUT_BUFFER = DM_COPY
    DM_IN_PROMPT = DM_PROMPT
    DM_IN_BUFFER = DM_MODIFY
    End Enum