XNAT client package for R requires RCurl and XML tcltk is needed for password prompting example: > library(R.XNAT) > central <- xnat.connection('https://central.xnat.org') > projects <- getProjects(central) > subjects <- getSubjects(central, project='CENTRAL_OASIS_CS') > mr <- getData(central, 'xnat:mrSessionData', project='CENTRAL_OASIS_CS') > close(central)