Updated documentation for multicast functionality

["T.Hval" <th1@ukc.ac.uk>]

Hi there!
Can anybody tell me where to find the most updated documentation for
use of multicast in ns. The manual does not seem to be up to date, since
when I try to enable multicast in my tcl scripts I get an error message
that tells me that what I wrote(copying from manual) is wrong, and gives
an example of how it is supposed to be. I find this a bit
insufficient, and would appreaciate a bit more comprehensive updated
documentation. (I'm using ns-allinone-2.1b5)

Thanks

Tor Hval