Ask HN: How do I distinguish the fourth from the third of these?

There are (at least) four types of interfaces that occur in programming.

Type #1. Command line. "foo --bar --baz". You step into the program, and then step out of it.

Type #2. REPL. You step into a program, do something, then it does something back in a sequential manner. You exit it when you want to.

Type #3. Word processor. The same as Type #2 except the REPL happens in real time instead of sequentially.

Type #4. GUI.

How do I distinguish the fourth from the third of these?