Boofo wroteA true portable program would have separate backups and cache files for each computer it is run on. ...
Yes. With respect to the two folders, that is precisely what this technique does.
Boofo wrote ... As far as editing any paths even once for each computer it is run on, that breaks the portability in itself. The program should automatically look for relative paths for the drive it is on.
The PT programs by default do exactly that.
However, since we want the Backups and Cache folders to stay with the system to which they pertain, we do that edit once. Without the edit, those two folders would be on the memory stick and you don't want that if you want the PT programs and settings there to be usable on more than one computer.