How to handle an external HID button click in C# -

I'm trying to integrate one of my existing projects into third-party hardware, basically on every button of hardware There are two buttons with different color alarms

I have been able to open and close each of the leadership with the library / manual which is provided by the manufacturer without any problems. My problem is that I can not click on my event from any type of software C / C # / VB etc ...

I mean that when I get one of my buttons It works like an input device and its effect is due to the open program, like a keyboard key or mouse click like the current position of the cursor (for example if MS Word is currently opened, then it's space Works like?). There is no special function for this purpose in DLL or manual (like mouse click event?).

So what am I asking is there any normal way to click any external tool button inside a C # program? How do the currently running software understand how to click a button and enter the desired method in the code?

Any clue or tip will be highly appreciated.

Thanks ...