Input Director is designed for those users who have two or more Windows systems at home. Via this system you can place the monitors of your machines side by side, and control them both with just one keyboard and mouse. In other words, join various systems and control them as if they were one.
To determine which system you´re controlling simply move the cursor off the screen and it will automatically appear on the next one (similar to a multi-monitor system). You can also do it via a combination of keys.
Input Director also lets you share the clipboard contents, so you can copy data from one machine to another. You can also do this with files shared on a network.
Input Director is completely free and only needs just over one megabyte of space.