Input Director is a Windows application that lets you control multiple Windows systems using the keyboard/mouse attached to one computer.
With Input Director, you can share a single keyboard/mouse across a set of systems. You switch which system receives the input either by hotkey or by moving the cursor so that it transitions from one screen to the other (in a very similar fashion to a multi-monitor setup). The idea being that you can position the monitors from two or more systems in a row and use a shared keyboard/mouse to control all of them.
Input Director also supports a "shared" clipboard, in which you can copy data onto the clipboard on one system, transition across to another and paste.
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Been using Input Director for years. Works great!