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(A) Menu key:
Menu key is pressed to access or leave menu screens.
(B) Left arrow:
Left arrow key is used for browsing a screen and to move selection of parameters to the left or upward.
(C) Right arrow:
Right arrow key is used for browsing a screen and to move selection of parameters to the right or downward.
(D) Enter key:
Enter key (also known as Enter button) is pressed to select a highlighted parameter on the screen.
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