Q: How do I send control characters to a process?
 
A: You can send any characters to a process with the print command. 
To represent a control character in Perl, use \c followed by the letter. 
For example, control-G can be represented with "\cG" . Note that this 
will not work if you single-quote your string. So, to send control-C
to a process in $exp, do: 

  print $exp "\cC";

Or, if you prefer: 

  $exp->send("\cC");




##</code><code>##

$vt220_pgup = chr(27) . chr(91) . chr(51) . chr(126);
print $exp $vt220_pgup