For the most part it was done via datatypes library, so had that survived into an era of internet security most of the fixes would have been in the shared libra

For the most part it was done via datatypes library, so had that survived into an era of internet security most of the fixes would have been in the shared libraries. Same went for a lot of shared common features. Update the OS and every program would update look and file requesters etc. None of the strange Windows mix of software that clearly looks of the previous release, or sometimes of the next. Or half a dozen legacy file requester dialogues.