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OpenProcessToken (advapi32)
The OpenProcessToken function opens the access token associated with a process, using this function we can get a handle to the access token assosiated to the process, if needed we can use this hanle with GetTokenInformation Api function to get SID and other informations inside that token.

C# Signature:

[DllImport("advapi32.dll", SetLastError=true)]
static extern bool OpenProcessToken(IntPtr ProcessHandle,
   UInt32 DesiredAccess, out IntPtr TokenHandle);

VB Signature:

Declare Function OpenProcessToken Lib "advapi32.dll" (ProcessHandle As IntPtr, _
   DesiredAccess As Integer, ByRef TokenHandle As IntPtr) As Boolean



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