Maybe you want to be more specific about your need. You might want to create a module for the code contained in your perl2.cgi file. Something like that (untested):

MyModule.pm:

package MyModule;

sub something {
    my ($param) = @_;
    # do something here
}

1;
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perl1.cgi:

use MyModule;

use CGI;

# process something here...
my $result = process_something_here();

MyModule::something($result);
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perl2.cgi

use MyModule;

use CGI;

# process other thing here...
my $result = process_other_thing_here();

MyModule::something($result);
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Maybe you have to think about your problem. Maybe you want to share a specific part of your perl2.cgi file. If you want that, create a module (perlmodlib) and share that. It is better than glueing a lot of CGI's together.

Hope that helps.

If the other program you need to call is really a CGI program then you should look at WWW::Mechanise.

## This is perl1.cgi

## lots o' code goes here

require (perl2.cgi);
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