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> It was suggested to me to read the endnotes first, start to finish, then to go back and read the poem.

I read it with two copies open, so that I was reading the poem and the endnotes in parallel.

The original alt-tab is flipping between pointer fingers in a book.

The original dual screens is two copies.

Seriously though, there is greater cognitive overhead in alt-tab than side-by-side

There is less muscle movement in the neck, and therefore less strain, with alt-tab.

Just as Charles would have wanted :)