The page turn buttons work in all four apps. The O-ring does different things in different apps (eg up/down increases and decreases font size in AIReader and OnyxReader, but scrolls up and down by a line in Cool Reader). For some reason, FBReader now simply crashes when I try to open that book. No great loss.
The O-ring is awkward to use. You really wouldn't want to use it to turn pages.
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