On input, the character with hexadecimal value A3 will prevent the next character from being expanded should a translate be in effect for it. For example, the Home key has a hexadecimal value of A0, but is translated on input into the three character string:
<command char>1<newline>
If you would like to prevent this expansion (to enter the key's value) then you should proceed it with the - key on the numeric keypad which generates the code for the Macro Disable character. You can of course enter the Macro Disable character itself by typing the - key twice.