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Actually, it looks like this may work, as note here Share your Magic Mouse between 2 Macs. This should be able to be extended to where both the keyboard and the mouse are Bluetooth and replacing the KVM with a USB switch.

For the setup we used the following hardware:

• 1 mac mini (running 24/7 as a home server)

• 1 Mac Pro (it’s a hackintosh inside a Mac Pro case)
• 1 Apple USB Keyboard and 1 dual-link DVI Monitor
• 1 Apple Magic Mouse (Bluetooth)
• 1 Belkin Flip KVM Switch (DVI-D 2-Port)
• 1 small Bluetooth 2.0 USB dongle

Actually, it looks like this may work, as noted here Share your Magic Mouse between 2 Macs. This should be able to be extended to where both the keyboard and the mouse are Bluetooth and replacing the KVM with a USB switch.

For the setup we used the following hardware:

• 1 mac mini (running 24/7 as a home server)

• 1 Mac Pro (it’s a hackintosh inside a Mac Pro case)
• 1 Apple USB Keyboard and 1 dual-link DVI Monitor
• 1 Apple Magic Mouse (Bluetooth)
• 1 Belkin Flip KVM Switch (DVI-D 2-Port)
• 1 small Bluetooth 2.0 USB dongle

Actually it looks like this may work, as note here Share your Magic Mouse between 2 machintosh computers

For the setup we used the following hardware:

• 1 mac mini (running 24/7 as a home server)

• 1 Mac Pro (it’s a hackintosh inside a Mac Pro case)
• 1 Apple USB Keyboard and 1 dual-link DVI Monitor
• 1 Apple Magic Mouse (Bluetooth)
• 1 Belkin Flip KVM Switch (DVI-D 2-Port)
• 1 small Bluetooth 2.0 USB dongle

Actually, it looks like this may work, as note here Share your Magic Mouse between 2 Macs. This should be able to be extended to where both the keyboard and the mouse are Bluetooth and replacing the KVM with a USB switch.

For the setup we used the following hardware:

• 1 mac mini (running 24/7 as a home server)

• 1 Mac Pro (it’s a hackintosh inside a Mac Pro case)
• 1 Apple USB Keyboard and 1 dual-link DVI Monitor
• 1 Apple Magic Mouse (Bluetooth)
• 1 Belkin Flip KVM Switch (DVI-D 2-Port)
• 1 small Bluetooth 2.0 USB dongle

You can't do that because the keyboards and mice are paring to each computer not to the USB Bluetooth dongle itself. In other words OS X sees the that USB bluetooth dongle as Bluetooth hardware for the current mac its connected to. So when you change to the next mac on the USB switch, that mac says I now have a Bluetooth card installed, it has no memory the keyboard you just had connected. Additionally your keyboard will think the computer it was connected to is no longer present.

And the mouse and keyboard does not have the ability to pair to multiple macs at the same time or switch though a list of known computers.

Actually it looks like this may work, as note here Share your Magic Mouse between 2 machintosh computers

For the setup we used the following hardware:

• 1 mac mini (running 24/7 as a home server)

• 1 Mac Pro (it’s a hackintosh inside a Mac Pro case)
• 1 Apple USB Keyboard and 1 dual-link DVI Monitor
• 1 Apple Magic Mouse (Bluetooth)
• 1 Belkin Flip KVM Switch (DVI-D 2-Port)
• 1 small Bluetooth 2.0 USB dongle