How does it work - Updater restarts networking VM stack without shutting client qubes

General Discussion
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I used to drive myself crazy on 4.1 or less closing down chains of qubes when I updated something (e.g. sys-firewall).

Now we have a wonderful Updater tool that manages to shutdown and restart all the networking sys-qubes (disposables) without their client AppVMs needing to be shut as well.

I may never understand the answer, but - how does that work, and can it be done manually (i.e. is it only Updater’s special power)?

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You can do the same from the Qubes Manager using the restart function. Only the widget won’t work because it checks for attached qubes first.

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