Ds are passed by the client to the cache manager that calls, when needed, the <a href="ft2-cache_subsystem.html#FTC_Face_Requester">FTC_Face_Requester</a> to translate them into new <a href="ft2-base_interface.html#FT_Face">FT_Face</a> objects.</p>
<p>If the content of a given face ID changes at runtime, or if the value becomes invalid (e.g., when uninstalling a font), you should immediately call <a href="ft2-cache_subsystem.html#FTC_Manager_RemoveFaceID">FTC_Manager_RemoveFaceID</a> before any other cache