<p>This is probably a most frequent challenge for Mac users as many students in Vienna are using Internet connection form Chello at their home. It is not possible to several computers at the same time to connect to a modem. When using a Mac Computer, you may connect to the Internet only through ethernet slot. Moreover, you will need to register your computer's ethernet-ID with your provider (Chello) in order to access Internet. It is different when using Windows, where users can simply just install required modem driver to a computer. When using Windows,there is no difference in kind of computer one uses. What is needed is to only install a modem driver. Whereas on Mac OS, it will not be sufficient, because your Internet access is only valid to that computer, which Ethernet-ID is registered to Chello (Internet provider).</p>