[BensonBear]

When one reads a paper book, one often has to check something somewhere else in the book. To do this, one typically does something like putting one's finger in the book at the current location, to enable searching around in the rest of it.

One can then flip back and forth between two sections in different spots, reading parts of both of them until the connection between them is established or re-established in one's mind. Then one returns to reading as normal.

This should be possible in an ebook also. The process would be:

1) set temporary bookmark
2) look around at will using any technique available (including even switching books)
3) toggle back and forth between current location and temporary bookmark
4) when done, cancel temporary mark and return to reading.

This requires two new commands for steps 1,3,4: "toggle temporary bookmark" and "swap temporary bookmark and current location".

This is easy to implement, and very important in a typical person's reading.