Complete Selection completes a partially typed function name.
This command reads your current selection (which should be a single word or an insertion point following a word) and looks up possible completions in the list of all currently defined functions and variables.
This command also provides completions for keyboard aliases and full names of special characters, such as \[Alpha] and a .
This command works only when you are connected to a Mathematica kernel.
When there is only one possible completion, Mathematica automatically inserts the additional characters to finish what you have typed. Otherwise, a pop-up menu lists the various possible completions. To insert one of them, click the completion you want, or type another letter to reduce the list of possible completions.
Press Backspace to cancel the pop-up menu.
If the list is long, you can scroll through the menu by moving the mouse up or down or by using the arrow keys.
Keyboard shortcuts: k (Windows); k (Macintosh); k (X).