User`s guide

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Indexed Use the UP/DOWN arrow keys to make your selection, or enter Y(es)
to enable indexing and N(o) to disable indexing. If indexing is
enabled, you can map a specified encryption key to two different
indexes. You can then switch indexes to change the channel to which
the key is slaved. Any key slaved to a channel will now use the
corresponding key from the new index. Keys may be indexed until the
maximum number of available slots are used.
Hardware Slot This is a view-only field. If the Indexed column is set to Y(es), this field
displays the number assigned by the system to this hardware slot.