Q. Is it possible to read Nook books on a Kindle? Is there an e-reader that handles books from multiple e-bookstores?

A. The Barnes & Noble Nook e-books and Amazon’s Kindle e-books use different formats, but dedicated users have shown it is possible to convert and read Nook books on an Amazon device. How you do it depends on the hardware you have — and can take some technical fiddling to copy over Nook books to a Kindle e-reader or Fire tablet.

Slinging e-books between two brands of e-readers is generally unsupported by all companies. It can also involve breaking the built-in copyright protections — so read all the fine print to fully understand what is allowed.