Port scanning lor...
Port scanning can tell what ports are opened or closed, therefore,
revealing the type of operating system or programs in use.
For example, when you connect to the Net, it automatically uses
port 80. It's the default port. If you have set your firewall to
prompt you each time, take a closer look at the prompt. It will say
XXX program attempting connection to www.whatever.com port
80.
Port 80 is too common, so it makes no sense scanning it.
But what if you have something like port 6346 opened? It gives clue
that a P2P program is in use. Specifically Shareaza. Shareaza uses
this port by default. So if you are using Shareaza, this port will
be open and when Singnet does a scan, Singnet will know you are
using P2P.
