Here's an interesting item I ran across: Mouse without Borders. It lets you control up to four PCs simultaneously with one keyboard and one mouse. It's sort of like a KVM switch but done entirely in software. It even allows you to drag and drop files from one computer to another.
Microsoft runs a project called The Garage. It is intended as a place where ideas can be explored and developed. Ideas that pan out are often added to future Microsoft products. This one got released as a free, standalone product. It only works on Windows systems.
Microsoft posted a YouTube video that shows how it works. (The demo starts about one minute into the 2:16-minute video.)
You can read more about it — and find the download link — in the TechNet blog, "Microsoft download from The Garage: Mouse without Borders."
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LoginI have installed it on 2 of my XP machines and it works! I can eliminate a keyboard and mouse from my desk!