Webcam Button Problem

I got USB webcam and also used my webcam to take pictures so it has button for this purpose even if I capture images with a button inside my program I want to do same thing by using hardware button which is on my webcam. How can I use hardware button on the webcam? which port it use it is not like a keyboard key so how can I handle it etc. Pls help me thank you in advance and sorry for my pidgeon english

It's hardware spesific...

Can you do it in C#???

I know it is hardware but c# has smart solutions for all kind of problems maybe there is a solution to understand which button is pressed when I click my webcam's button. Is there any way to understand what kind of input is coming when I clicked my webcam's button?