dialup directive not implemented?

[Mike Serra]

Hi Hobbit users,
I have a simple question about the "dialup" directive in bb-hosts, the
one that is supposed to come immediately after a page or subpage
directive, and is used to ping a range of hosts, like a modem pool.  Our
sysadmin tells me that he read (in a man page online?) that this
directive is not implemented.  And it's acting like it isn't: we can't
get it to do anything, despite trying every possible syntax that could
make sense.  But on the other hand people online talk about this as if
they're using it just fine.  So -- is it implemented?  We are using
hobbit version 4.2-beta-20060605.
Thanks,
- Mike Serra