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The PS/2 versions also will usually let you switch machines via a keystroke. I think mine has the ability to switch by clicking a desktop icon, if both machines are Windows.
Good luck.
Here is the setup:
[personal laptop]----[LCD]----[Work Laptop]
The LCD monitor functions as an extended desktop to both machines...but I can only view one at a time. I love this setup.
If you want I can check and see exactly what brand/model number it is. I bought it for like $50 online.