Short question: OnScreenDisplay => x,y parameter

[Gintaras]

To x and y separately. For example can be x -1 and y 1, then OSD will be at the top-right corner.

At the moment I use (x) 0 and (y) -1 to display the message at the center bottom of my screen.
I works perfectly on my screen, but I do not know if this is actually correct.

It is correct.