You can use any combination of keys that you like but there are reasons to avoid certain keys. For clarity, please understand that you can use the following keys if you wish.
|ALT||This key is used to invoke keyboard macros.|
|BACKSPACE||This key is used in the property sheet and hierarchy.|
|Arrow Keys||This key is used in the property sheet.|
|ENTER||This key is used in the property sheet and hierarchy.|
|TAB||This key is used in the property sheet.|
|ALT+F4||This key is reserved by Windows.|