wireless keyboard and mice question.

[CaMSpoon]

I have a question about the wireless keyboards and mice. I wanna know if i can use the same reciever if i buy them seperate?
This is what im doing.. I wanna buy the logitech DiNovo wireless keyboard and mouse (not bluetooth version) And give the mouse to my brother becuase all i want is the keyboard. Now how would he use the mouse since im using the reciver on my computer? Is there something he can buy?

thanks in advance