Working once on a MacBook with a disabled trackpad, I found the only window that I could not focus using the keyboard was the password dialog. I realized later

Working once on a MacBook with a disabled trackpad, I found the only window that I could not focus using the keyboard was the password dialog. I realized later that AppleScript could do the trick: (as root) # ps axo ucomm | grep -q SecurityAgent && osascript -e 'tell application "SecurityAgent" to activate'