This article is from the AmiTCP/IP FAQ, by Mike Meyer with numerous contributions by others.
You could probably set the variable to "name only", since AmiTCP/IP itself does not use the variable at all. Some application programs (such as e-mail) might have problems, though. The current standard on the various Unix versions is that the HOSTNAME is the fully qualified host name (with the domain).
AmiTCP 3.0 and 4.0 fix this by implementing the gethostname() function differently (the name is taken from the name server/host database instead of the HOSTNAME variable if possible).
 
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