Making the Dock immutable

Question

A relative who has difficulty with mouse control keeps inadvertently removing items from his Dock. I enabled Parental Controls to prevent him from doing so, but Parental Controls has a bug that prevents access to secure websites, including any banking site.

How do I lock the Dock so that it cannot be modified, without making use of Parental Controls?

Answer 1

I found an answer on Apple Support Communities:

defaults write com.apple.dock contents-immutable -bool true; killall Dock