Commands

?a - set cursor to home position.
?b - destructive backspace
?f - clear LCD and leave cursor at home position
?g - beep
?h - backspace
?i - forward cursor
?j - up cursor
?k - down cursor
?l - clear current line and leave cursor at the beginning of the line
?m - carriage return.  Position the cursor at the beginning of the current line.
?n - new line.  Advance to the beginning of the next line and clear this line.
?t - tab.  Advance the cursor one tab.
?? - display the character '?'.