This thing of having a screen editor where you could move the cursor and execute any command instead of a linear terminal was a staple of 1970's and 1980's comp

This thing of having a screen editor where you could move the cursor and execute any command instead of a linear terminal was a staple of 1970's and 1980's computers. Oberon also is notable for letting you execute code written anywhere (and so allowing code to be used as command palettes or menus)