many ways to do that!
you can use sessions, cookies, get or post variables!
you can pass the value of $Bold in URL like:
welcome.php?Bold=true
and then access it with:
$_GET['Bold']
or you can post it in a form and retraive it with:
$_POST['Bold']
to use sessions, you have to start your session with session_start() and set the value of the session with:
$_SESSION['Bold'] = 'true';
and retraive it with:
$_SESSION['Bold']
finaly cookies. to set a cookie use:
setcookie('Bold', "true", time()+3600);
to retraive it use:
$_COOKIE['Bold']
HTH