//Christine Nattrass, University of Tennessee at Knoxville, 2010
void TestAlien(){

  char * kXML = "collection.xml";
  if(gSystem->Getenv("XML") )
    kXML = gSystem->Getenv("XML");
  else
    sprintf(kXML, "collection.xml") ; 
    
  if (!TFile::Open(kXML)) {
    printf("No collection file with name -- %s -- was found\n",kXML);
    return ;
  }
  else cout<<"XML file "<<kXML<<endl;

  //Load necessary libraries and connect to the GRID
  gSystem->Load("libNetx.so") ; 
  gSystem->Load("libgapiUI.so");
  gSystem->Load("libRAliEn.so"); 
  TGrid::Connect("alien://") ;

  //return;

  //Feed Grid with collection file
  //TGridCollection * collection =  (TGridCollection*)gROOT->ProcessLine(Form("TAlienCollection::Open(\"%s\", 0)", kXML));
  TGridCollection * collection = (TGridCollection*) TAlienCollection::Open(kXML);
  if (! collection) {
    AliError(Form("%s not found", kXML)) ; 
    return kFALSE ; 
  }
  TGridResult* result = collection->GetGridResult("",0 ,0);
   
  // Makes the ESD chain 
  printf("*** Getting the Chain       ***\n");
  TChain * chain   = new TChain("esdTree","myESDTree") ;
  Int_t nEventsPerFile = 0;
  for (Int_t index = 0; index < result->GetEntries(); index++) {
    TString alienURL = result->GetKey(index, "turl") ; 
    cout << "================== " << alienURL << endl ; 
    chain->Add(alienURL) ; 
  }
}