In reply to:

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The way I did that was to make the last N script that preinit executes run the player with the -s- option. Since it won't return, it will never get around to running the real init.

It will return, though, if you exit the player (does this happen when syncing?), so you might want to put it in a loop emulating the stock init, if you care.

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Perhaps preinit should come with a file to run the player (N99player, I guess), rather than having it compiled-in. Then people could easily play with the script, remove it, or override it (using their own N90player that doesn't return, for instance).