In Normal and Numeric modes, each time you quickly enter the same key, the next character available on that key will be displayed. If you do
not press a key for more then 1 sec, the current character will be selected and the cursor will move right for the next selection. For example, to enter
ABC
"c" you need to press
3
4
5
6
quickly four times. To enter the displayed character, release the key or press another key.