use strict;    # Always start a Perl script with these two without them
use warnings;  # there are many subtle ways to shoot yourself in the foot
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 Perl
# 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 may want
#  to use logfile, send output to the cgi invoker, or just throw it away
Print "the command: $batfile $param\nGasve the result: $result";