Real VNC is not to complicated and it’s free
For example you have two computers that you want to remote to each other. For one PC to connect to another, one would have to be the client and the other the server.
If you want to remote onto each other they both have to have the Real VNC server software running.
The Real VNC software comes with the client and server in one installation
At one of the computers (PC1)go to Start/all programs/Real VNC and run VNC server user mode
an icon should appear in the task bar with a green V which means the server is ready to accept a connection.
Right click over the icon. it should show an IP address, make a note of it.
On the other machine (PC2) you’ll need to run the VNC viewer user mode.
This should connect you to Machine (PC1) run it and put in the IP address.
this should connect you
If you have problems connecting make sure your not behind a firewall and that both PC’s are accepting on the port the VNC uses 5900.
There is a lot more to it like adding a secure password, but this is the basics.