Why are you trying to do this? Curiosity?
I can't really help you since I've only ever had one Bluetooth-enabled device at a time.
Uh, gusxavier is the OP. I'm assuming you were talking about me. 😛
If your computers aren't connected to a wireless network, you can set up a computer-to-computer network between them. Then enable file sharing under the Sharing preference pane on both computers and they should appear in one another's Network window in Finder (available under Finder's Go menu).
1) How can I use a WPA secure network? Could you post some screenshots?
2) I use Windows XP by Bootcamp on my Macbook. How can I use the internet under Windows?
3) A printer is plugged to the Macbook. This printer works only under Windows. How can use the printer by the iMac?
1) I've created the network as you told me on your post. But I didn't see a WPA network option.
2) A cable modem is plugged to the iMac. So, I've created the network and now I'm using the internet on the Macbook wirelessly. But, when I log in Windows I can't access the internet connection.
3) A laser printer is plugged to the Macbook. It works only under Windows. Not on Mac OS.