ShowUserSelector* calls ShowUserSelectorCommon for launching the applet, which does the following:
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* When isSkipEnabled is set, the first user in invalidUidList must not be set, and additionalSelect must be 0 (asserting otherwise). When enabled [[Account_services#TrySelectUserWithoutInteraction|TrySelectUserWithoutInteraction]] will be used to select the user (with isNetworkServiceAccountRequired), in this case the applet will only be launched if that cmd doesn't return an user.