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					Originally Posted by Tx65  For example the reader might show 2 books at once on a split screen (for example: top half of the screen: Harry Potter in french. Bottom half: Harry Potter in english. One gesture scrolls both books at the same time). | 
	
 AFAIK, only some Android and iOS apps offer this feature. For example, 
Aglona Reader. 
However, it's relatively easy to create interlinked bilingual books, if someone has already aligned the source and target segments. 
For an example, see my simple 
French-English Kindle version of the Three Musketeers. (Also available as an 
ePub.)