accessibility profiles, what is it and how it works?

[Pavel Vlček]

Hi,
after today's update, when I press alt f10 key, I get accessibility
profiles menu. I am using Orca normally, but no profile was selected.
I changed it to screen reader witch speech. What changet? I am using
Ubuntu daily, to install the Ubuntu, I used live dvd from 10th March.
In this dvd, there was not language select screen and try and install
buttons. It booted to desktop, using English language.
Can you explain please, how the accessibility profiles work?
Thanks,
Pavel