HP 510 ユーザーズマニュアル

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Navigation keys
The display section of the front panel consists of an LCD display and the following five navigation keys, provided 
to navigate through the menus displayed on the screen:
The Up 
 and  
Down keys let you scroll through the various items in a menu list.
The Menu key takes you to the main screen. It 
cancels
 any choices that have not yet been selected by 
pressing the Enter key.
The Back key takes you to the previous screen.
The Enter key selects the item in the menu list and makes it current. If there are sub-selections to be made, 
this key takes you to them; otherwise it takes you back a screen.
.
Back
Up
Down
Menu
Enter