The first section of this paper gives a brief overview of the experiences with LAN-based CALL programs for Arabic in the past 7 years at Leiden University (The Netherlands). The second section discusses constraints and technical challenges related to the use of Web-based CALL for Arabic, focusing in particular on a new Web-based CALL application, "Ellips," developed by a consortium of Dutch universities. The "Ellips" system has been integrated into the Arabic curriculum at Leiden University since the autumn of 2003. (Contains 8 figures and 4 notes.)