I have an iMac in one room and a MacBook in the adjacent room. Whichever machine is turned on first gets the Apple BT mouse and keyboard. This is annoying because I have the BT mouse/keyboard as the only input to the iMac so if I turn on the MacBook first and the iMac later, it cannot connect to the devices. I always have to go to the other room, shut down the MacBook, then restart the MacBook later. Is there a way to force the MacBook to ignore the two BT devices all the time?