use strict;
use warnings;

use Time::HiRes qw(usleep);

print "start\n";
usleep(2000000);
print "finish\n";

use Term::ReadKey;
ReadMode 4; # Turn off controls keys   4  or  "raw"
my $key;
while (not defined ($key = ReadKey(-1))) {
    # No key yet
    print ".";
    usleep(2000000);
}
print "Get key $key\n";
ReadMode 0; # Reset tty mode before exiting

##</code><code>##

start
finish
GetConsoleMode failed, LastError=|6| at C:/Strawberry/perl/vendor/lib/Term/ReadKey.pm line xxx.