Can anyone tell me where the main computer is physically located on or in the ’01 2500HD Silverado?

Sounds sort of funny asking where the MAIN computer is – am I driving a truck or the star ship <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:City w:st="on"><st1:place w:st="on">Enterprise</st1:place></st1:City>?<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

It's on the drivers side near the rad. Right under the TCM. A pain in the @ss to remove IMO.