Marc-Andre Lemburg <m...@egenix.com> added the comment:

Marc-Andre Lemburg wrote:
> 2. COMPUTERNAME returns an uppercase version of the host name (which we
>    could lowercase to stay b/w compatible), however I'm not sure
>    whether this is the same as the socket.gethostname() or the
>    NETBIOS name and I'm also not sure whether this is always set.
> 
>    This link suggests that it's using the NetBIOS name:
>    
> http://www.scriptlogic.com/support/CustomScripts/environmentVariableReference.html
> 
>    The official Microsoft page is unclear about this:
>    http://technet.microsoft.com/en-gb/library/bb490954.aspx

More evidence that the NetBIOS name is used:

http://msdn.microsoft.com/en-us/library/aa368009(VS.85).aspx
http://msdn.microsoft.com/en-us/library/ms724295(v=VS.85).aspx

One problem with this approach is that changes to the NetBIOS name
are not seen by those APIs and variables, e.g. if the machine
get's an update via DHCP. The other is that NetBIOS itself is
being phased out in favor of DNS names - which socket.gethostname()
returns, so we'd be replacing a new technology with an old one.

http://blogs.technet.com/b/networking/archive/2008/12/16/netbios-browsing-and-windows-server-2008-x64-server-core.aspx

BTW: Why doesn't socket.gethostname() use GetComputerNameEx()
which does support Unicode ?

See http://msdn.microsoft.com/en-us/library/ms724301(v=VS.85).aspx

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