the broadband provider you are with has bandwidth restrictions in
place then you may have to keep track of your usage
so you don't overuse the service and have to pay extra money or
so you can make sure you use it and keep within the limits.
broadband provider may well provide you with live updates of how
much you have used, you should either contact your broadband provider
or check out your account area online and you may have access to
this for free.
however this is not available then you do have other option in the
form of download monitoring software that is able to record how
much you use. These are only really able to be used on a single
PC and not a network.
a number of different download monitoring software packages available
that are either free or don't cost much