HRESULT hRes = CoInitializeSecurity(
                NULL,    //Points to security descriptor
                -1,    //Count of entries in asAuthSvc
                NULL,    //Array of names to register
                NULL,    //Reserved for future use
                RPC_C_AUTHN_LEVEL_NONE,    //Default authentication level
                            // for proxies
                RPC_C_IMP_LEVEL_IMPERSONATE,//Default impersonation level
                            // for proxies
                NULL,   //Reserved; must be set to NULL
                EOAC_NONE,//Additional client or
                    // server-side capabilities
                NULL);  //Reserved for future use