The Citrix Virtual Apps and Desktops documentation specifies that the Local Host Cache feature allows connection brokering operations in a site to continue when the connection between a Delivery Controller and the site database fails. This implies that the Delivery Controller, which is part of the FlexCast Management Architecture (FMA) services, uses the Local System account to access the Citrix Virtual Apps and Desktops SQL databases in scenarios where the primary database connection is unavailable.