I believe QtWebKit uses QStandardPaths::StandardLocation to determine where to write data on disk, so setting QCoreApplication::applicationName to a unique value for each web application should do the trick.
I believe QtWebKit uses QStandardPaths: :StandardLocati on to determine where to write data on disk, so setting QCoreApplicatio n::applicationN ame to a unique value for each web application should do the trick.