How to use

Nucleus Co-op#

Click on Add New Games and search for a game handler for the game you want to split-screen, see which games are supported?

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Click on the handler cover and be sure to read through the guide or info for the game.
Click on Install or Download Handler and when Nucleus asks you to add the game, click Yes and browse to the game's executable. Most Steam games will be in C:\Program Files(x86)\Steam\steamapps\common\. Some games will have their real .exe stashed away in a folder called bin or binaries.
If you already have the handler (.js) inside Nucleus Co-op handlers folder you can click on the Search Game icon to add the game to Nucleus Co-op.
You can also download the handlers from the website handlers hub, then in Nucleus Co-op click on the Extract a Handler icon, choose the .nc file you downloaded and add the game.
Once your game is added, select it in the Nucleus Co-op UI and assign the input devices to parts of the screen by dragging the devices. The input devices icons will show and light up when they receive input (maintain a button press for controllers). Change the layout of each screen by clicking the icon in the top-left corner of each screen, if you have multiple monitors connected they will show in the UI.

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Read the handler author's notes below the game cover, read them carefully as they contain important information related to the handler functionality.
When you are ready, click the > button. If there are any handler UI options, configure them. Then press PLAY.
Wait a bit for the games to start and their windows to be resized and positioned. If you are using multiple keyboards and mice, you may have to press the End key to lock the input after the games are set up for the keyboards/mice to work correctly.
Follow the handler notes to connect the games together.