This applet works differently in every browser, but most of these differences
aren't important.  I've tried this applet on various machines I have
access to, and it seems to run decently on HotJava (Solaris), Opera (Win95),
Internet Explorer (Win98), and Netscape 4.7x (Win95; Win98).
It does not run entirely properly on Netscape 4.6x on Linux and Solaris:
the "Calculating" animation doesn't work, and the graph do not reset when
the Run button is pressed.  I suspect this has something to do with
the Java runtime included with this version of Netscape.

The more serious problem occurs on Macintoshes.  On Netscape 4.7x
for Macs, this applet will not load: the status bar says that ParrondoApplet.class cannot be found.  I don't know why this happens, but I will try to fix it.  Also, I will try Internet Explorer for Macs as soon as I can find a Mac with IE installed.