To use it, move first to a cluster directory, and enter xbda. On-line help has been prepared for most buttons. To read it, locate the mouse cursor on the chosen button and press <help> on the keyboard. Basically, the right hand settings define the type of data you want from the database, and the command button executes the action. A dialogue line allows you to enter star numbers when required. You can change of cluster by entering a cluster number, changing also from NGC to IC or anon (abbreviated menu button) and clicking on the button labelled "chdir". "Next" presents either a menu or moves you to the next panel. "Quit" terminates the work.