Send data to source engine (Half life 2)?

[whynotme]

Hi,

I want to send data to other program. There is a source engine for Half life 2 and I want to send data from hardware to USB to source engine. I have program to catch USB data but don't know how to send it to source engine, I am not familiar with C++, most of my software is write in C#.

Could you suggest me some clue?

Thanks