How to control the cursor inside the program window?

Question

Mouse

How to control the cursor inside the program window?
use
mouse_event
[DllImport("user32.dll")]//Import mouse clicks
But this is controlled by the real mouse cursor. When minimizing the window does not work.
But it is necessary that when the window is minimized, clicks occur inside the program window.
The mouse cursor only works over the screen.
How to make the cursor work inside the window?