Follow along with our video and guide to setup and use Multiplicity.

Make sure the Steam client is installed and active on the computers you would like to connect using Multiplicity.

Before using Multiplicity, it is important to determine which computer will be the Primary machine (the one that uses its keyboard and mouse to control the Secondary machine) and Secondary machine (the one that is controlled).

Click “Install” on Multiplicity in your Steam Library. This will download the installation files to your PC. When downloading is complete, click the “Launch” button in Steam. This will start the Multiplicity Installer outside of Steam.


After installation, you'll be presented with a screen asking if you want to set your PC up as a Primary or Secondary computer. You’ll want to setup your Secondary PCs first.


Make sure to copy the passcode on your secondary PC for later use!

Run setup on the Primary PC next. When prompted, designate this as your Primary PC.

Now that you've activated your Primary PC, you can add your Secondary PC. Go to the Multiplicity window, click ‘Add computer,’ and select and add your Secondary PC. Remember that passcode from before? This is where you'll need it again.



Match the PCs on the grid with your own setup. If needed, drag the Secondary PC to its corresponding position on the grid. There are plenty of spaces to match whatever setup you need.


Now you can control the Secondary PC with your Primary keyboard and mouse.

It is easy with Multiplicity. First you must demote your Primary machine by by clicking on the slider in the top right of the config window. A prompt will pop up asking if you are sure. Clicking YES will deactivate this PC through Steam as the Primary and allow activation on another PC. Remember, you can only have 1 PC as Primary activated at any time.


Next, you will go to your Secondary machine and click the same slider, that’s it!