Set Process BorderStyle using P/Invoke

Question

Hi All!
I'm writing a program where i need to use the touch screen keyboard. I invoke it using the process.Start() method but i want to disable the borderstyle because my user can't close the keyboard.
I know that i can't do it directly and i need to use platform invoke but i don't know how to use it.
If you have any example to how change the border style, i will appreciate it.

Thanks to all!