the guy siad he's new
So?
and he mentioned Arduino. ??
Your point being?
so what is it that you are asking him?
The post has a question about why Processing throws an exception when an external web cam is connected to the PC, and Processing is told to read that camera instead. There was nothing in the post about any problem with the Arduino. As far as we know, the Arduino is something that belongs to a neighbor of a cousin of a friend of the postman that delivered a package to a coworker's mother-in-law.