C# Signature:

//from winnt.h
enum SECURITY_IMPERSONATION_LEVEL {
    SecurityAnonymous,
    SecurityIdentification,
    SecurityImpersonation,
    SecurityDelegation
}

[DllImport("advapi32.dll", SetLastError=true)]
static extern int DuplicateToken(IntPtr ExistingTokenHandle, SECURITY_IMPERSONATION_LEVEL ImpersonationLevel, out IntPtr DuplicateTokenHandle);

VB .NET Signature:

Declare Function DuplicateToken Lib "advapi32.dll" (ExistingTokenHandle As IntPtr, _
   SECURITY_IMPERSONATION_LEVEL As Integer, ByRef DuplicateTokenHandle As Integer) _
   As Boolean

User-Defined Types:

None.

Notes:

As always, only do SetLastError=true if you actually intend to call GetLastError.

Tips & Tricks:

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Sample Code:

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Alternative Managed API:

TODO

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