For example, suppose you want to sandbox your torrent client. You can create a .wsb file to give the sandbox access to the torrent client application folder as well as your downloads folder, and specify a logon command like "C:\Shared\Torrent client\torrent.exe". When you click the .wsb file, a sandbox will spawn and the torrent client will automatically start, but it will only have access to the two folders you shared, not all the filesystem. And once you close it, the sandbox will be wiped, but the data on the shared folders will remain.
This can work for many programs, especially portable applications, games, and other software that doesn't interact with the broader OS. Just by sharing the program folder, you can get "persistence" in a way.
[1] https://learn.microsoft.com/en-us/windows/security/applicati...