UPDATING TAG USAGE STATUS (BOZZA)
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[Tags] are marked as used the first time they are
referenced from any [code] of your [application].
The fact that a previously used tag becomes no more
used in the [application] is not automatically
detected. An updated of [tag] usage status can be
requested with menu Tools / Update tag usage. The
usage status is cleared and the [application] is
scanned for actual [tag] usages. This update could
be useful to [delete unused tag] or to [edit a tag]
(because some changes to [tag] are not allowed when
it is marked as used.