C# Signature:

///<Summary>Commands to pass to WinHelp()</Summary>
enum WinHelpCommands : uint
{
     ///<Summary>Display topic in ulTopic</Summary>
     HELP_CONTEXT = 0x0001;

     ///<Summary>Terminate help</Summary>
     HELP_QUIT     = 0x0002;

     ///<Summary>Display index</Summary>
     HELP_INDEX    = 0x0003;
     HELP_CONTENTS     = 0x0003;

     ///<Summary>Display help on using help</Summary>
     HELP_HELPONHELP   = 0x0004;

     ///<Summary>Set current Index for multi index help</Summary>
     HELP_SETINDEX     = 0x0005;
     HELP_SETCONTENTS  = 0x0005;
     HELP_CONTEXTPOPUP = 0x0008;
     HELP_FORCEFILE    = 0x0009;

     ///<Summary>Display topic for keyword in offabData</Summary>
     HELP_KEY      = 0x0101;
     HELP_COMMAND      = 0x0102;
     HELP_PARTIALKEY   = 0x0105;
     HELP_MULTIKEY     = 0x0201;
     HELP_SETWINPOS    = 0x0203;
     HELP_CONTEXTMENU  = 0x000a;
     HELP_FINDER       = 0x000b;
     HELP_WM_HELP      = 0x000c;
     HELP_SETPOPUP_POS = 0x000d;
     HELP_TCARD      = 0x8000;
     HELP_TCARD_DATA     = 0x0010;
     HELP_TCARD_OTHER_CALLER = 0x0011;
     IDH_NO_HELP     = 28440;

     ///<Summary>Control doesn't have matching help context</Summary>
     IDH_MISSING_CONTEXT     = 28441;

     ///<Summary>Property sheet help button</Summary>
     IDH_GENERIC_HELP_BUTTON = 28442;
     IDH_OK      = 28443;
     IDH_CANCEL      = 28444;
     IDH_HELP    = 28445;
}

VB.NET Signature:

'''<Summary>Commands to pass to WinHelp()</Summary>
Public Enum WinHelpCommands As UInteger
     '''<Summary>Display topic in ulTopic</Summary>
     HELP_CONTEXT = &h0001

     '''<Summary>Terminate help</Summary>
     HELP_QUIT     = &H0002

     '''<Summary>Display index</Summary>
     HELP_INDEX    = &H0003
     HELP_CONTENTS     = &H0003

     '''<Summary>Display help on using help</Summary>
     HELP_HELPONHELP   = &H0004

     '''<Summary>Set current Index for multi index help</Summary>
     HELP_SETINDEX     = &H0005
     HELP_SETCONTENTS  = &H0005
     HELP_CONTEXTPOPUP = &H0008
     HELP_FORCEFILE    = &H0009

     '''<Summary>Display topic for keyword in offabData</Summary>
     HELP_KEY      = &H0101
     HELP_COMMAND      = &H0102
     HELP_PARTIALKEY   = &H0105
     HELP_MULTIKEY     = &H0201
     HELP_SETWINPOS    = &H0203
     HELP_CONTEXTMENU  = &H000a
     HELP_FINDER       = &H000b
     HELP_WM_HELP      = &H000c
     HELP_SETPOPUP_POS = &H000d
     HELP_TCARD      = &H8000
     HELP_TCARD_DATA     = &H0010
     HELP_TCARD_OTHER_CALLER = &H0011
     IDH_NO_HELP     = 28440

     '''<Summary>Control doesn't have matching help context</Summary>
     IDH_MISSING_CONTEXT     = 28441

     '''<Summary>Property sheet help button</Summary>
     IDH_GENERIC_HELP_BUTTON = 28442
     IDH_OK      = 28443
     IDH_CANCEL      = 28444
     IDH_HELP    = 28445
End Enum

VB Signature

Public Enum WinHelpCommands
     HELP_CONTEXT As Long = &h0001
     HELP_QUIT      As Long  = &H0002
     HELP_INDEX     As Long = &H0003
     HELP_CONTENTS      As Long = &H0003
     HELP_HELPONHELP    As Long = &H0004
     HELP_SETINDEX      As Long = &H0005
     HELP_SETCONTENTS   As Long = &H0005
     HELP_CONTEXTPOPUP  As Long = &H0008
     HELP_FORCEFILE     As Long = &H0009
     HELP_KEY       As Long = &H0101
     HELP_COMMAND       As Long = &H0102
     HELP_PARTIALKEY    As Long = &H0105
     HELP_MULTIKEY      As Long = &H0201
     HELP_SETWINPOS     As Long = &H0203
     HELP_CONTEXTMENU   As Long = &H000a
     HELP_FINDER    As Long = &H000b
     HELP_WM_HELP       As Long = &H000c
     HELP_SETPOPUP_POS  As Long = &H000d
     HELP_TCARD     As Long = &H8000
     HELP_TCARD_DATA    As Long = &H0010
     HELP_TCARD_OTHER_CALLER  As Long = &H0011
     IDH_NO_HELP    As Long = 28440
     IDH_MISSING_CONTEXT  As Long = 28441
     IDH_GENERIC_HELP_BUTTON  As Long = 28442
     IDH_OK         As Long = 28443
     IDH_CANCEL     As Long = 28444
     IDH_HELP       As Long = 28445
End Enum