I access my computer remotely on occasion using ultravnc. I discovered recently that i can’t see avast modal windows remotely through ultravnc.
When i try to stop the avast service or uninstall avast remotely, i can’t see the avast modal window to confirm the operation, so it times out and does nothing.
I think you can’t see that message that runs like UAC at high level (darkening the screen and topmost) and unreacheable by remote access.
I’m not sure as I’ve only used TeamViewer and can’t remember this specific situation.