use Win32::GuiTest qw(:ALL);
use strict;

system("C:/ProgramData/Microsoft/Windows/Start Menu/Programs/Accessories/Calculator.lnk");

my @window=FindWindowLike(undef,"Calculator");
if(!@window)
{
die("cannot find window with title/caption Calculator\n");
}
else
{
printf("window handle of Calculaotr is %x \n",$window[0]);
}