I know that the original post referred to Apache on NT4, however if you're running a UNIX server (and so do not have access to the nbtstat command), there is a similar program called NBTScan which compiles on both UNIX and Windows.

It is available from http://www.inetcat.org/software/nbtscan.html. This page also links to a Perl version of the program which runs under UNIX (but requires Samba nmblookup utility to be installed).

JJ