What Cloppy does (The program I made) is simple, it polls the clipboard every 500ms and waits for the value to change, when it changes the new value is added to the listbox.
Double click an item and the value is placed into the clipboard buffer.
What I'm looking to do is create a shortcut to open the program, I figured I'd create a background process that listens for raw keyboard input and opens + focus the program.