Sometimes, it's nice to have a separate computer system on a computer monitor. As a freelancer, I have one that I use for;
Work;
Play;
In the past, you needed a hardware KVM for this, but today, software lets you share your keyboard and mouse smoothly over your network.
Microsoft has a free software KVM called Mouse Without Borders, which is perfect for this;
Download it for free here.
NOTE: Mouse Without Borders is Windows-only and does not support Macs or Linux systems. If you'd like to share your keyboard and mouse across multiple different platforms, there are many other software KVMs that support Macs and Linux systems.
One of the more popular open source KVMs is Barrier, which works on multiple platforms.
I've not tried it yet, if you like it, let me know.