Qt VNC && check user access

[luca]

Hi all,
I have an application running on a BeagleBoard and I start it with:
@
./myapp -qws -display VNC:0
@

Now I need to access it from internet but I'd like to check access and to require a password before allowing user to see my application.
I'd like to have something like a real vnc server that require a password to see remote desktop and can filter client with some role.

Is that possible?