I'm sorry but I think that you don't have understood my question.
I don't want to do that from the administration side (backend) but from the frontend.
For example, the customer have a control panel main and there he can see all orders, profile, etc...
When I enter on the order e can see on the display this order and I have added one button to send to print or to pdf this same order.
Now, I want to do the same, but to send this same order to customer email.
How can I do that?
Can you explain me, how can i call (for example) the function that I have in the backend when I press the button to resend the order?
Because in this case, for example, I can add a button in the frontend and when the customer press this button, call that function and send one email (calling for example the custom template inside email modules that we personalize on administrator side).
Can you help me with this?
Thanks