in reply to cannot load applet using Perl/CGI

This could be your issue. Hard to tell without seeing your code.

From CGI.pm - a Perl5 CGI Library, the CGI.pm online documentation

Most HTML tags are represented as lowercase function calls. There are a few exceptions:
The <param> tag used to pass parameters to an applet conflicts with CGI's own param() method. Use PARAM() instead.

In Section Seekers of Perl Wisdom