With Dynamic-Menu-Links you can create a menuitem which can link to different pages, depending on:

user
usergroup
accesslevel
date/time
device (desktop/mobile/tablet)
country
language
ip
current page

and much more...

Any of the above AND all combinations.

example:
if($userid){
//user is logged in
//redirect to frontpage
$redirecturl = 'index.php';
}else{
//user is not logged in
//redirect to login page
$redirecturl = 'index.php?option=comusers&view=login';
$message = "please login first";
}

Uses the PHP syntax, so you can custom script everything possible in PHP.