Hi,
The official documentation of version 4 states that it exists (see attached document).
Assign an AppStack to a User (pag.93 e 94)
Assign an AppStack to a Computer (pag. 95 e 96)
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Differences between version 4 and version 2.18
Version 4 Change VOLUMES (2.x) AppStacks
Version 2.18 - Change VOLUMES AppStacks
attached both documents (versione 4 and version 2.18)
ARomeo