The best way to do it is get a modem with an Ethernet output rather
than USB. If you must use the one you have, Windows used to have a
way to share an Internet connection from back in the dial-up days. The
PC with the USB connected modem must remain on all the time so the
other networked PCs can share its connection.
Look up "Internet Connection Sharing". It know it existed as recently
as XP, but it may still exist in Vista and 7. I'm not sure. Good
luck.
What kind of "modem" is this? Is it a telephone modem or something
else?
If it is a cable modem or DSL connection device, it may already have
an Ethernet connector built in...in which case you can connect that to
a cheap NAT router (readily available in stores where computer
products are sold) and plug that into (usually) up to four computers.
If you cannot do that, Windows and some other operating systems can be
configured to share your connection amongst other computers. To use
this, you'd need a cheap Ethernet network hub or switch, network
interfaces in each computer and suitable cabling for each station that
you will be plugging in.
A web search should give you more information about how to set up your
computer's software to do this, and how to hook it all up.
William
You'll have to network your PCs with a switch. Then you can use one of the
PCs, the one with the USB-modem, as a server for the other computers. Off
course that computer needs to be up and running when the others want to
browse on the net. In XP all facilities to do it are available.
petrus bitbyter
If the computers are peer 2 peer you need to install and configure
Internet Sharing. That is provided you use at least Windows XP which by
the way you were too stupid to mention what operating system you use.
Look it up on Google or Wikipedia.