ICQ

ICQ (pronounced "I seek you") is an Internet chat program which is now apparently used for mobile devices as well as desktop/laptop computers.

There are two ICQ ActiveLists devoted to Ars Magica, numbers 54311732 and #78479803. This requires ICQ 99b or better to use; get it from icq.com. Maintainer's note: these have not been verified lately and may no longer be active.