how to get current system macaddress by stored procedure

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SQL

Hi there,

I'm looking for a way to get the mac address of the current system by sql stored procedure.
I have found the following code by googling a lot, but i could not know what does this code do :

declare @t table
(
i uniqueidentifier default newsequentialid(),
m as cast(i as char(36))
)

insert into @t default values;

select
    substring(m,25,2) + '-' +
    substring(m,27,2) + '-' +
    substring(m,29,2) + '-' +
    substring(m,31,2) + '-' +
    substring(m,33,2) + '-' +
    substring(m,35,2) AS MacAddress
FROM @t

Is there any better way ?