Multiple Androids with one bluetooth keyboard Is there some software that simply lets me use one bluetooth keyboard to type on several different android tablets in front of me?

Provided:
The keyboard supports pairing with multiple devices, and it is paired with all of my tablets.

A solution to this problem should ideally give a way for me to choose which tablet is currently receiving keyboard input using only the keyboard; in other words, I shouldn't have to touch a screen in order to switch to another tablet.
No. Although the keyboard can pair with multiple devices, it can only be connected to one at a time. You can't fix that with software that runs on the tablet.