[Windows Central Question]

I have Two PC (i.e. 2 cases, HDD,RAM, graphic cards) BUT one mouse and one monitor and one keyboard.
What is called a box which allows switching between these two PC so that one or the other is seen on the monitor??

[HelloNNNewman]

You can use a KVM switch, but one that allows using a single keyboard between two computers aren't cheap.

https://www.amazon.com/KVM-Switches/...pUvbUpU3787098

Here is a good article giving you a few options:
https://news.wjct.org/post/ask-deema...-two-computers

[Golfdriver97]

Or, you could have 2 displays, one for each PC, and still use the KVM switch. I use a KVM, and I like it. Saves a lot of space on my desk.

[ShaneHaumps]

Perhaps you are referring to this: https://www.adorama.com/cvchehd300.html

Here's the instruction if you need this https://www.startech.com/faq/kvm-switches-setup

[Drael646464]

You can get HDMI switchers.

[Ryujingt3]

Another vote for the KVM switch.