How to use a computer on Win10 as a second monitor without wifi?

Question

Computer networks

Good afternoon. I will describe what I have:

PC1 - a laptop from HP on i7, Win11, has the following network interfaces:
1) Realtek Gaming GbE Family Controller (just a built-in gigabit network card)
2) Intel Wi-Fi 6 AX201 160Mhz
3) ASIX AX88179 USB 3.0 to Gigabit Ethenrnet Adapter (external gigabit network card, USB-C to Ethernet)

PC2 - iMac 27 late 2013 on i5, Win10 installed via BootCamp. Network interfaces:
1) Broadcom NetXtreme Gigabit Ethernet
2) Broadcom 802.11ac Network Adapter

Now the essence of the problem:
I need to use PC2 as a second monitor (and not duplication, but an extension of the desktop). I managed to connect it through "Projection to this computer". But the trouble is that it connects only via Wi-Fi 2.4Ghz, respectively, good delays, frame spills and other delights follow from this.
Then I connected an external network card from PC1 (since the Internet comes to the laptop via cable), shared the Internet from the main network card to it and got excellent Internet quality on the iMac. Turned off the wireless interfaces on both and tried to turn on the projection again. Naturally, nothing happened, because. Miracast requires the monitors to be connected via Wi-Fi because it uses Wi-Fi Direct. After torturing both computers for a long time, I gave up and came here.

Now, accordingly, the question. How to connect PC2 as a second monitor to PC1 via cable? If you manage to crank out this scheme using the regular functions of Windows, I will be immensely happy. But I understand that, most likely, this is impossible, so I can quite consider third-party software that will perform the same functionality, but via cable (and, accordingly, with better transmission quality). I would be very grateful for any help!

ps The resolution of PC2 is 2560x1440, so it's a very sad task to transmit it over Wi-Fi4, I think that the bandwidth of gigabit Ethernet should be quite enough.

Answer 1

There is such software - Spacedesk. Install the driver on one computer and the client on the other. It is quite possible to expand the monitor over the local network.

Answer 2

There is no software monitor to transmit over the network on a regular basis, but the problem can most likely be solved by an iron method:
* I heard but did not find miracast wlan network cards,
* there are also screen encoders (dvi / vga video encoder), connected to the output of the video card as a monitor and broadcast the picture over the network (dedicated ethernet cable, up to 200 meters)
upd: software, everything will revolve around vnc/anydesk/teamviewer or, for example, steam remote play (they have technology sharpened for games and not text and, most importantly, they can use a gpu encoder)

Answer 3

What prevents you from using remote support software? Aspia for example. Connect the monitor to the laptop, expand the screen on it and set up the host on the PC to connect to it as a client.

Answer 4

I once asked the same question. Didn't find an answer.
As a result, I used 2 PCs using one set of keyboard and mouse.
This program allows you to use as many PCs on the network as one:
https://www.microsoft.com/en-us/download/details.a...
Naturally, the OS and applications on all PCs are independent. Common only cursor, keyboard and clipboard.