sites that will simply throw them away.

                          - 17 -
 


One optimization is that an article should never  be  sent
to  a machine listed in the Path line of the header.  When
a machine name is in the Path line, the message  is  known
to  have passed through the machine.  Another optimization
is that, if the article originated on site A, then site  A
has   already  seen  the  article.   (Origination  can  be
determined by the Posting-Version line.)

Thus, if an article is posted to  newsgroup    "net.misc",
it  will match the pattern  "net.all"  (where  "all"  is a
metasymbol that matches any string), and will be forwarded
to  all  sites that subscribe to net.all (as determined by
what their neighbors send them).  These sites make up  the
"net"   subnetwork.   An article posted to   "btl.general" 
will reach all sites receiving  "btl.all",  but  will  not
reach  sites  that do not get  "btl.all".   In effect, the
articles  reaches  the   "btl"   subnetwork.   An  article
posted  to newsgroups  "net.micro,btl.general"  will reach
all sites subscribing to either of the two classes.

































                          - 18 -