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Is there any indication in a P3Speller generated data file as to what the index of the current menu is at any given time during the session, when using submatrices?

No, there is not. It is however not difficult to add a state variable that contains this information. Just declare such a variable in the constructor of the P3SpellerTask class, and set it to the index of the matrix at the beginning of P3SpellerTask::LoadMenu().

Regards,
Juergen

As of rev. 3901, there is now a SpellerMenu state variable that contains the one-based index of the current menu. It may also be set from outside (e.g., via the AppConnector protocol, or by operator scripting) in order to switch menus.

-Juergen

Good news, thanks!