Access 97 Combo Box Hot Key

Does anyone know of a hotkey to display the drop down list when the cursor is in a combo box? The key(s) to press must have the same effect as clicking on the arrow in the combo box. (Yes, I hate using the mouse.) I’d like to give my users (and myself) an alternate to taking their hands off the keyboard and clicking on the mouse (other than typing the beginning letters of the data). This would be especially useful where data already exists in the control.