urlwrite instruction for Matlab 2013b

Hi,

Can anyone explain to me how to use urlwrite function in 2013b version? With the suthentication parameters also. I want to download some files which are linked through some url with http authentication. But my problem is that I can not find a good document about the parameters for urlwrite together with authentication.

 URL = 'http://csa.esac.esa.int/csa/aio/product-action'; 
 fileName = tempname; 
 gzFileName = [fileName '.gz']; 

 [gzFileName,st] = urlwrite(URL,gzFileName, 'Authentication', 'Basic', ...
    'Get', {'Username', '<username>', 'password', '<password>', ...
    'DATASET_ID', 'C1_CP_WHI_ELECTRON_DENSITY', 'START_DATE', ...
    '2011-11-10T18:00:00Z', 'END_DATE', '2011-11-10T21:00:00Z', ...
    'NON_BROWSER', '1'}); 

 gunzip(gzFileName); 
 fileNames = untar(fileName); 
 for iFile = 1:numel(fileNames)
    disp(fileNames{iFile});
 end

here is one example, but I do not know what is the meaning of all those: DATASET_ID', 'C1_CP_WHI_ELECTRON_DENSITY', 'START_DATE', ... '2011-11-10T18:00:00Z', 'END_DATE', '2011-11-10T21:00:00Z', ... 'NON_BROWSER', '1'}

Can anyone help me with this? I believe the urlwrite in 2013b has the authentication function right? Thanks in advance