#!perl -w
use Net::OpenSSH;

my $ssh = Net::OpenSSH->new("hostname");

if (my $pid = fork) {
 # wait for children, do something
} elsif ($pid == 0) {
 exec "another_perl_script";
}
__END__

another_perl_script:
#!perl -w

use Net::OpenSSH;

# do something to retrieve master connection
my $ssh = Net::OpenSSH->...

$ssh->system("remote command");

...