Question: Grabbing MAC Serial Number

Is it possible to create a standard (appearing) contact form on my site - asking for the user’s name, email address (“please confirm”), etc - but use that form to grab the user’s MAC serial number, which would then become part of a security device for a piece of software I created. The code itself would be something like this (I think):

do shell script “echo "” & userEmail1 & “\n\n” & localSerial & “"
| mail -s "” & userName & " - Serial Number"

(If anyone is interested, it’s to finally get the MAC version of this puppy on the market:
http://www.acim-ebook.com/Home.html).

Thank you much in advance.