if you have a x window emulation on your windoz box
like exceed or cygwin xfree86 and an x window libraries
on your unix box, you could set you display. see example below

#!/usr/local/bin/perl -w

use strict;
use Net::Telnet;

my $username = "xxxx";
my $passwd = "xxxx";
my $hostname = "xxxx";

#use Net::Telnet ();
    
       my $t = new Net::Telnet (Timeout => 10,
                              Prompt => '/}/');
    $t->input_log('Tempature.out');
    $t->errmode('return');
        $t->open($hostname);
        $t->login($username, $passwd);
    $t->print("ksh");
    $t->print("export DISPLAY=10.231.14.57:0.0");
    $t->print("nohup /usr/openwin/bin/xterm &");
    sleep 2;
    $t->close;
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