In order to upgrade some old hardware we have decided to move our "Windows NT 4.0" with very old software to the Proxmox VE. I've managed to configure Video and Network but there is one problem still unresolved - mouse synchronization while using remote control (I have tried both web-browser client and standalone VNC client). Unfortunatelly "-usbdevice tablet" doesn't work for Windows NT 4.0. I Have also tried to find VNC with "mouse grabbing" option but haven't manage to find any. The only idea I have currently is to install VNC server inside "Windows NT 4.0" but that solution is a kind of work around and not very stable (most of modern VNC servers doesn't work in Windows NT 4.0).
So, I'd like to ask the community if someone has a similar experience and can share any ideas how to get local and remote mouse cursors synchronized? Thank you!