Network Neighborhood and Entire Network

1. Both of the above recently showed up in my System-Tray.
2. There are two other people who use this computer and no
one here knows how these "buttons" came about to be in our
set-up.
3. I can find nothing in any Help screens to explain how
to make use of them or, more importantly, how to get rid
of them. After all, the more junk there is on a computer,
all the more chance for something to go wrong.