Where there is a finite set of meaningful text inputs (symbol names, names of existing files or editor commands, and so on) the IDE helps you to enter your text by offering completion . When you invoke completion, the system takes your partial input and either:
When your input remains partial, you may repeat the completion gesture.
When you see a choice of the possible meaningful inputs, certain gestures allow you to narrow the choice and quickly select the desired input, as described in Selecting the completed input.