Connect laptop to monitor?

I have a windows 10 pc and laptop. Now I want to take the laptop as a 2nd screen next to my monitor. My Windows 10 does not recognize the laptop. (using HDMI) could someone give me a detailed description of how to proceed?

As far as I know it is not possible as you would like.

That will not do. The laptop should have an HDMI input. But he does not. I also no laptop or PC with HDMI input known.

You also have to be careful not to damage your devices. That gives a short circuit. Both HDMI ports are outputs. Both thus provide a voltage.

We should go, the hdmi is only output so that you can transfer the image to a monitor or TV, but you can't use the screen of a notebook for other devices

Thank you! What about a TV?

Well a TV has an entrance. Of course that works.

What do I have to do to make it work?

Connect your HDMI cable to your notebook (or PC) and the other end of the cable to the TV HDMI port.

I have done nothing.

What have you done?

Plug one end of the HDMI cable into the TV under HDMI IN 3 and the other end into the monitor.

So one cable in the TV, the other cable in the notebook?

Exactly.

And selected on the TV remote HDMI port 3?

Yes.

And the screen of the TV remains blue and in black is: No signal

Then make a notebook, then restart. TV set on.

Then again notebook and then restart. Start TV.