Lot of peaple ask real soft for do the copy. It's because soft like ultracopier, supercopier, teracopier, copyhandler exists. The target is that's will by 100% integrated and transparent to the end user (like firefox). The compatibility with ultracopier via the catchcopy protocol allow use other copier use in api win32 only and asure all copier (which repect the protocol) interpolability. And the style of Qt application is 100% transparent. The copy with copier like ultracopier boost the speed, allow better error management (resume/retry on error), pause, speed limitation, group the copy list for prevent lost of performance.