HOW TO MODIFY VNI TYPING METHOD:

1 - Click on VNI Tan Ky XP button to activate the program:

2 - Right click on the Vietnamese button to open a window:

3 - Current accent key style is "User 1" with VNI default style, you may modify this current style by changing the desire keys in the boxes or add more accent keys for the empty boxes. Click on OK button when you are finished: