About Broadband Broadband Basics What does ADSL stand for? What is a modem? What does 'always on' mean? Can I use the telephone at the same time? What are ADSL filters and what do I need to do with them?          More FAQs >   Compatibility What operating systems do you support? What PC specification/operating system and equipment will I need? What Apple Mac specification/operating system and equipment will I need? Are all BT Calling Features supported? What is the effect of installing ADSL on my alarm line?          More FAQs >   More About Our Products What's the difference between 'with modem' and 'without modem'? Can I have another telephone extension running from the splitter/front plate or ADSL filter? What is the specific transmission speed for BT Yahoo! Broadband? How much can I download? Can I use remote access software to administer my computer?          More FAQs >   Moving Home What should I do if I am moving home?