Select the input method.
Follow the steps in the procedure How to Select an Input Method to select the input method.
The status area shows that the GB2312 code input mode is on.
Type the first three of the four keys that represent the character to display. In this example, type b0a of the string b0a1.
The first three letters are visible in the preedit area.
Type the fourth key.
The character automatically replaces the letters in the preedit area.