In this section we give a walkthrough of using Jumpshot to view a very simple parallel program. We defer to Section Interesting Examples the viewing of more interesting examples. Jumpshot can be used either in stand-alone mode by running the jumpshot command or, when properly installed, from a Web browser, in which case it will run as an applet. In either case it begins with a simple opening window, as shown in Figure 1 .
The ``look and feel'' of Jumpshot is by default ``metal'', the default appearance of the Swingset class library. In the System Options menu it can be changed to have a Motif, Windows95, or MacOS appearance. Figure 2 shows the difference between Metal and Motif looks.
The logfile-selection menu allows one to browse in the file system for a logfile, produced in any of the ways described in Section Producing Logfiles . Then the main window appears, as shown in Figure 3 . Since reading the logfile and drawing the initial screen may take some time, depending on the size of the logfile, a ``progress'' window appears while the logfile is being loaded. The initial display provides the primary view of logfile data, together with access to other views.
