I wanted to use my Tablet as a touchscreen monitor for my computer.

To do so, I installed Vino:

sudo apt-get install vino

Disabled the encryption (I'm on a secure intranet):

gsettings set org.gnome.Vino require-encryption false

And started the server:

/usr/lib/vino/vino-server &

On Android, I downloaded bVNC

And connected to port 5900.

Magic ensued.

A 1:1 size ratio between the tablet and the monitor would be helpful: it's difficult to get the mouse pointing in the right direction.