How to make that pc "pushes" keys itself? C++

Question

I think make a program that it "pushes" a key. For example, this program pushes "k" and if I am in the desktop, find the shortcut that starts with "k". Sorry for my english

Answer 1

https://msdn.microsoft.com/en-us/library/ms646310(v=vs.85).aspx

Answer 2

what language

Answer 3

sorry.. c++