Look for a remote access software which is possible to connect even when the monitor of the host machine is not connected

Question

My setup is as follows:

• Computer 1 and Computer 2 are connecting to only 1 monitor through a HDMI Bi-Direction Switch. Just by pressing button on HDMI Bi-Direction Switch, I can switch between Computer 1 and Computer 2
• I have Computer 3, which wants to remote access to Computer 1.

I want to use Computer 2, and let other (Computer 3) to access Computer 1 at the same time. But I can not because

• When both Computer 1 and Computer 2 is turned on, but Computer 2 is using monitor.
• Then Computer 3 can not access Computer 1 anymore (in fact, Computer 3 can access, but can not control anything of Computer 1). If I switch monitor to use Computer 1, then Computer 3 can access Computer 1 as normal.

I have tried several software such as TeamViewer, Chrome Remote Desktop, but none of them worked.

Can you suggest any software or any other method that works?

Thanks very much.

Answer 1

If the machine that you're trying to access is is running Linux, you could use ThinLinc for this task. ThinLinc will create a full virtual desktop session for the client and doesn't need a screen connected to the host machine.

ThinLinc is free for up to 5 simultaneously connected users.

Other option includes VNC (TigerVNC, etc), but I think that ThinLinc is way better and easier to setup than VNC, for example, ThinLinc already has sound redirection by default and can be accessed from multiple users simultaneously.