ImpersonateLoggedOnUser

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