I want to make my Arduino to send array of keystrokes with a delay to my PC just like a normal keyboard was, the only difference is that, keys are already declared and an ON/OFF button to start/terminate the program when running.

what confuses me are this questions in my mind:

- and i think there's a library needed to be called to make this thing works
- can i reuse keyboard chip, control it to send button to pc?


Actually, i have no idea how arduino works.. this was just a redesigned idea of my program that i want to do. my first program works but when i want it to be applied on different application, it didn't. so i was hoping that an external like keyboard that will send keystrokes to my computer will allow me to use it in any applications i want. please help me.. 

- sorry if this post is not in its right place