One trackpad, two MacBooks

Hi,
at home we have an Apple Cinema display with a keyboard wired into it, along with a magic trackpad and two macbooks.
My problem is that when my girlfriend's been using it, I have to get her to unpair the trackpad from her computer before I can do it on mine. This is pretty annoying, and I always thought I could just sit down and click on the trackpad powerbutton twice to switch the pairing from her macbook to mine. But it never works. Anyone know if this is possible?
I know you can click and hold the power button on the trackpad to turn it on or off. But you can also click on it once, then quickly click again and hold it until the LED blinks. This means -- I assume --- that it's back in discovery mode. But nothing happens from here, and it seems to still be paired with my girlfriend's macbook.
As far as I can see, this click + click-and-hold is undocumented, so I was hoping there was an undocumented way of switching pairing on the trackpad alone.
Any hints?
Regards,
Christian

Hello:
Short of getting a new girlfriend , a Bluetooth device may be only paired with one thing at a time. What you describe is normal behavior.
Barry

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