Do read the above links, they are good. Do you want to wait for that .bat file to finish before your script continues, or do you want the script to carry on once it starts the .bat. If the latter, what should happen if the script finishes before the .bat it launched? Here is some totally untested code to give you some ideas

use strict;    # Always start a Perl script with these two without the
+m
use warnings;  # there are many subtle ways to shoot yourself in the f
+oot
use CGI;       # Load the module to handle CGI stuff

my $cgi = CGI->new(); # get a CGI object.

# Point to the batfile, notice we can use / as a path separator in Per
+l
# even when we are in a Windows world.
my $batfile = 'c:/program files/mycode/batman.bat'; 

# I guess you are going to get the parameter from the CGI invocation
my $param   = $cgi->param('some_field'); 

# run the command and wait for it to complete. Catch STDERR
my $result = `$batfile $param 2>&1`; 

# This probably won't work as we did not set up an http header, you ma
+y want
#  to use logfile, send output to the cgi invoker, or just throw it aw
+ay
Print "the command: $batfile $param\nGasve the result: $result";
[download]

This code will be saved in your cgi-bin and invoked with a url like:

Cheers,
R.