What does kssendmac set?

[Robin Bowes]

Hi,

I have a cgi script that I use to generate kickstart files for various 
hosts.

I use it something like this:

... ks=http://example.com/cgi/ks?host=foobar.example.com

I'd like to use the machine mac address to determine the host 
configuration to be used and have just discovered the "kssendmac" directive.

Can someone tell me what additional information that directive sets and 
how I should look for it in my CGI?

Thanks,

R.