[kangxi]

I'm busy using Calibre to edit the metadata for the books in my library, trying to set up some consistency with the tags, when a couple of thoughts struck me.
For each update, does Calibre update the matching metadata of the duplicated books sitting within the kindle? If not, is there any way to synchronise metadata files?
And second, does the Kindle (mine's a paperwhite) pay any attention to the tags anyway? If I do a search my Kindle appears not to return any book other than matching titles or authors and ignores common search terms within the tags.