How do you simulate the use of the keyboard ?

[goFreeLoop]

In my script, I would like to simulate the fact that someone presses on the "x" key on the keyboard and then presses Return.
I got some info from web, but still confused

#!/usr/bin/perl -w
require 'sys/ioctl.ph';
die "no TIOCSTI" unless defined &TIOCSTI;
sub jam {    
local $SIG{TTOU} = "IGNORE"; # "Stopped for tty output"    local *TTY;  # make local filehandle    open(TTY, ">/dev/tty")                 or die "no tty: $!";    for (split(//, $_[0])) {        ioctl(TTY, &TIOCSTI, $_)            or die "bad TIOCSTI: $!";    }    
close(TTY);}
jam("@ARGV\n");

If anyone knows how to do that or if it is even possible to do it. Cheers !