b s d and orca

[Linux for blind general discussion]

Some earlier versions of mate called orca screen-reader and there was and
> maybe still is an f4 key that toggled accessibility on and off with system
> default set as off.

Not sure about F4, but if enabled, the key should be alt_super_s. The 
problem is that it appears to be disabled by default. Running orca from 
the alt+f2 window should work though.

~Kyle