when I click "next" in the first TW (host) TW it opens the next slide
in the target TW, but not in the host TW

That's right. It would be trivial to make the macro open the next tiddler in both windows* - it's just a UI issue at that point...

is it possible to have a "back" button as well

This should be relatively easy as well - the code for determining the next slide could simply be reversed:
    var next = slides.indexOf(current) + 1;
    next = slides[next < slides.length ? next : 0];
becomes:
    var prev = slides.indexOf(current) - 1;
    next = slides[next >= 0 ? next : slides.length - 1];


-- F.


* "opener" in the code refers to the target window; replacing that with "window" would perform the same operation on the "host" window

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