... Previous: New User Requirements for Astronomical Data Visualization . ... AstroGrid and the Australian Virtual Observatory have built a grid of services to allow users of DVR remote access to computer clusters running DVR, and to data archives. Our system is built using OGSI-compliant grid services, accessed via a web portal. ... We based the system on the Open Grid Services Infrastructure (Tuecke et al. 2003) which defines the extra semantics added to generic web services to make grid services. ...