When menu selection is accomplished by code entry, a standard command entry area (window) should be provided where users enter the selected code.
Additional Information:
That entry area should be in a fixed location on all displays. In a customary terminal configuration, where the display is located above the keyboard, command entry should be at the bottom of the display, in order to minimize user head/eye movement between the display and the keyboard. Experienced users might key coded menu selections in a standard area identified only by its consistent location and use. If the system is designed primarily for novice users, however, that entry area should be given an appropriate label, such as "ENTER choice here: ___."