Generally in Indexed systems, either the shifting or the derailleur component contains the indexing logic.
Here is a list of components currently on VeloBase.com which utilize the Mavic Index Systems shifting mechanism.
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 | Mavic 840 | 840 | | Mavic; Dura-Ace SIS; Dura-Ace STI; Friction |
 | Mavic 845 | 845 | Paris-Gao-Dakar | Mavic; Dura-Ace SIS; Dura-Ace STI; Friction |