How can a keyboard be shared with an iPad?

What are the ways for both an iMac and an iPad to share the same physical keyboard?

If it's possible to share a regular Apple bluetooth keyboard between both devices without jailbreaking the iPad, I think it would be my favored option.

Logitech made a solar bluetooth keyboard allowing keyboard to pair 3 device .

With your apple bluetooth keyboard,

JUC400 Wormhole switch will do this. Or If you use mac, app "type2phone"is a altinative solution.

I don't think you can. Bluetooth is designed such that pairing is two-way (computer <-> device). You can't pair to a second device without un-pairing from the first device.

Bluetooth only allows pairing with one device at a time.

This might help you, or at least lead you in the right direction.

http://modmyi.com/forums/iphone-news/716935-synergy-ipad-share-your-mouse-keyboard.html

Theoretically using the computer as a middle man, You could set a hotkey to switch between the two? No program exists to do it though :(