OK, so when you're making alot of links to other sheets, it becomes tedious that you have to do the link one at a time - switching back and forth between the sheet and the pop-up of the sheet you're linking to. There are also other times when it's nice to have more than one sheet visible at a time
So if it were possible to have two windows visible at the same time, particularly if you could to the whole [ Sheet 1, cell x, type "=", click on Sheet 2, cell 2, hit enter ] functionality available, that'd be swell.
There are some workarounds to make this happen for sure. Just an idea for the future.