Re: Underscore? What is a hostname?
Back when I was a lad the hostname was the leftmost part of the fully qualified domian name.
If your local computer was called wally (the host name) you could refer to it as "wally" in your local domain but had to refer to it as "wally.mydomain.co.uk" from elsewhere.
So I assume (without looking it up) that "wally.my_domain.co.uk" might also be valid?
Or has hostname (as with many other things) been changed to a more "modern" meaning?