public static extern int AcceptSecurityContext(ref Common.SecurityHandle phCredential,
                                                ref Common.SecurityHandle phContext,
                                                ref Common.SecurityBufferDesciption pInput,
                                                uint fContextReq,
                                                uint TargetDataRep,
                                                out Common.SecurityHandle phNewContext,
                                                out Common.SecurityBufferDesciption pOutput,
                                                out uint pfContextAttr, //managed ulong == 64 bits!!!
                                                out Common.SecurityInteger ptsTimeStamp);
 private static extern int AcquireCredentialsHandle(
     string pszPrincipal,                            //SEC_CHAR*
     string pszPackage,                              //SEC_CHAR* //"Kerberos","NTLM","Negotiative"
     int fCredentialUse,
     IntPtr PAuthenticationID,                       //_LUID AuthenticationID,//pvLogonID, //PLUID
     IntPtr pAuthData,                               //PVOID
     int pGetKeyFn,                                  //SEC_GET_KEY_FN
     IntPtr pvGetKeyArgument,                        //PVOID
     ref Common.SecurityHandle phCredential,         //SecHandle //PCtxtHandle ref
     ref Common.SecurityInteger ptsExpiry);          //PTimeStamp //TimeStamp ref