Topic summary
Control characters
Extracted from the Wikipedia article Control character.
In ASCII
Control characters may do something when the user inputs them, such as Ctrl+C (End-of-Text character, ETX) to interrupt the running process, and Ctrl+Z (Substitute character, SUB) for ending typed-in file on Windows. These uses usually have little to do with their ASCII definition. Modern systems often describe shortcuts as though they are control characters ("type a Ctrl+V to paste") but the code number is not even used to implement this.